Yes, it is a complete kit (no engine or trans though). The bed itself is also available on its own, but with a plain tailgate, as the one in this kit is a standard Dodge tailgate.
Right now, this one is stalled, I'm waiting to get with W-M-D for an engine block (going to attempt to make my own Poly 318) plus I still need to make the decals for it.
Those 4bbl trucks (RPO LB1)seem to be more of a fleet option, rather than emissions. The trucks I've seen were all in Illinois and Indiana. The Dual Jet, which is a very common carb, was used on the passenger car versions of the 4.3, as well as the earlier 229 V6, the Buick V6, the late production 292 inline 6, and 60 degree 2.8. You are right about it looking similar to a Quad, it's more or less a Quad split down the middle. Very familiar with them, as I have an S10 with one on it.
Unfortunately, Harry, that happens far too often. depending on what state your in, all one has to do to get plates is present a clear title and vin. In many cases, vehicles have even been title using a title from a completely different vehicle. In Illinois (Downstate anyway), for example, you don't even require a safety inspection to get a registration and plates. I know I've certainly seen plenty of poorly built cars, not always rat rods, either. Guys with lifted 4x4s, donks, and lowriders can bejust as guilty of poor workmanship and design. I've had the misfortune of having to service a few of them.