...Where are you sourcing the Buick engine?
Are those the rear tires you're going to use? The rears look a little modern/small in comparison with the fronts.
Seeing all these '30 coupes pop up (you, Dave, Lyle) now I'm starting to get the itch. Meanwhile, my poor roadster and '40 coupe aren't done yet. Isn't this hobby great? 
Thanx Dennis.
Aw c’mon, start another one…
Unfortunately the rear tires will gave to stay as is. I simply can't find anything else that fits those rims that aren't the same width and diameter as the fronts. That's why these were always my mockup wheels. But I've been outvoted!
Now here’s more than you’ll ever want to know about 1/25 nailheads (although I’m sure I’m leaving lots of other stuff out…).
I'm probably going to build the Nailhead from one of the 4 Tommy Ivo Showboat engines I got. I bought the Revell Showboat kit strictly as a source for those beautifully detailed motors. So far I've used one on a rail I built last year:

Unfortunately what you get is essentially a shortblock with a nicely detailed Hilborn injection setup and really nice injector stacks. The oil pans have 45 degree slanted bottoms to make up for the angled mount of the motors in the drag car. For this build I made a new bottom for the pan but didn't need to do anything else. But there's no bellhousing, transmission, accessory drive, belts, pulleys, etc.
So... In the wonderful world of aftermarket parts I got this l;ittle item:

Beautifully cast by Norm Veber at Replicas and Miniatures Co. of Maryland, it's a re-pop of the oil pan, transmission, accessory drive and shift linkage from an old Revell Parts Pack Nailhead which itself used the block and injection from the Showboat. BTW, this item is NOT listed in Norms regular catalog. You have to ask… And... no drive pulleys and belts, generator, or carburetor manifold. For this I am using the parts that can be found in the AMT '40 Ford Sedan Delivery kit (You can also find it in the Coca Cola '40 Ford coupe variant). This has a complete nailhead including block-hugger headers if you were planning on using it in a more confined area. There are several other kits that offer Nailheads with various variations in terms of carburetion, valve covers, spark plug wire shields, etc., mainly various AMT 60's Buicks. The reason I'm not planning on using the AMT nailhead is the detailing on the block and heads is a bit soft.
And finally there's this item from The Parts Box in Australia:

This is the full monte as it were. I've ordered one today but I'm want to keep on building this guy so I'm probably going the Ivo route. At 18.00 AUD (about 14.50USD) it's about the price of a source kit for an AMT nailhead and less than a Showboat kit on e-bay (if you can score one). However they have a 25.00 AUD minimum order and shipping is about another 10.00 USD so it's best to have need some other of their cool stuff if ordering from them.
I know you are a confirmed kit basher so go to Bob Black's awesome DPMCC instruction sheet resource (
http://public.fotki....ruction_sheets/ ) and search the AMT section for the 40 Fords and various Buicks. Or you can be like me and help support the artisans of the aftermarket...
Edited by gbk1, 18 July 2009 - 05:40 AM.