Copied from The Boat Owners Association of the United States website: http://www.boatus.com/boatTECH/articles/bilge-blowers.asp
"Venting your bilge of potentially lethal gas fumes is no job for a jury rig. Bilge blower units are designed and constructed specifically for their life in the trenches - electrical components are "ignition protected" to prevent sparking and causing the explosion that they are installed to avert, and the units are built to withstand over-heating and corrosion. However, most bilge blowers are NOT designed for continuous use. They are designed to be run for a short while only. If you run them continuously you may burn them up or even start a fire. There are continuous use bilge blowers available and if you want this (and it can be a very good idea) be sure you get one designed for this and wire it properly. Bilge blowers are available to move air in two ways - some units feature a squirrel cage configuration, while others favor a "tunnel", or "in-line" design which utilizes a small fan. The type you choose will depend on the space available and on how you plan to mount it. Both types evacuate air very efficiently, and are available in sizes which handle 100-250 c.f.m. (cubic feet of air per minute). The size you need is determined by the volume of your engine compartment (see below). The best plan is usually to have two blowers, one to blow air out and the other to suck outside air into the engine space. However great care must be taken that the outside air intake is free of CO and other fumes."
Guys started putting V8 engines in 914s well before that...mid '70s. Kennedy Engineering made the engine-to-trans adapters. We put V8s in the back seats of Corvairs too, and Crown Manufacturing made a kit to do it. There were also a few crazy Porsche 911s built with V8 engines mounted in the rear...one of which used a complete Oldsmobile Toronado drivetrain. And there were some Beetles with V8 engines, front-mounted or rear-mounted.
Lotsa guys have built relatively cheap air-extractors and / or paint booths, vented to the outdoors, using easily obtained bilge-fans for boats. Boat bilges can build up explosive concentrations of gasoline vapor. A US Coast Guard approved bilge fan SHOULD be suitable for use in potentially dangerous atmospheres. Some kitchen exhaust fans are also rated for explosive atmospheres. Atomized, hot cooking grease can be highly flammable. Do your due diligence research.
Neither car would have been remotely legal as a gasser. Possibly legal to run modified-sports, but only with the engine in the original mid or rear location. Altered, maybe, or maybe a gutted shell used for a Comp Coupe class, like this one in '64.
Early on, engines in gassers had to be in the more-or-less original location, and later on only 10% setback was allowed.
Not irked so much as...hmmmm. I'm coming up on the end of my part of the '47 Caddy job (once she's running / driving, she goes away for paint and upholstery) and the tying-up-loose-ends mechanical and electrical details always seems to drag on forever. Still some systems to sort too, like integrating the 2014 XTS shifter with the 4L80-E gearbox (going to require a magic bellcrank to reverse the direction the control cable comes in to the shift lever on the gearbox), modifying the PRNDL to illuminate correctly (the XTS PRNDL is computer controlled, and we're not using any XTS electronics), component boards for the HID lighting, and on and on and on. Oh well. You eat the pachyderm one bite at a time.
I have a couple of the first and subsequent releases, both stock and the BRE car. I agree, it's really quite a nice kit...and it's way better a representation of the subject than Revell's Porsche 914 of around the same vintage. The Webers are quite good if you replace the molded air-horn blobs with decent velocity stacks, too. I've owned and built my fair share of these in 1:1 too, still have 2 engines, one equipped with Webers!
Looking good. Bright silver is one of the tougher colors to do well, and yours looks great. Nice clean swap too. The LS is showing up in just about everything these days. As nicely-balanced and all around good-handling as this generation RX-7 is stock, it should be a real ball of a car in 1:1 with the Chebby V8.
Here's a video pan-around of that engine built up; maybe that will help you. Remember also than on any conventional V-8 engine, one cylinder head is ALWAYS farther forward than the other one. On the big-block Chevy, which this is, the head farthest forward is the LH, driver's side.