Hot rods aren't as formulaeic as Cobra replicas, so vendors haven't been motivated to do a similar, "all inclusive kit", too much individuality demanded on the hot rod side. That being said, there are (or were, depending on what the current economic environ has wrought) some vendors that will assist you with what are called roller packages which entail a fairly complete chassis and body. They they will sell you each of the needed components on a piece by piece basis, and if your negotiating skills are adequate you should be able to wrangle some savings there. One such vendor is Street Rods by Michael, Street Rods by Michael. Street Rod Parts, Frames and Turnkey Cars One of the older members here had them build him a car and they treated him very fairly and provided good quality. I've bought parts from them and they were very service oriented. They carry a lot of rod products so you'll have lots of choices. Even if you don't think this is a way you want, you may learn things by talking to them.

One other possible alternative, if you're not too into individuality or wrenching, is a car something like Superformance or Backdraft, from Speedway Motors. Pretty cookie cutter, red, repro steel body, comes complete less engine and trans, assembled in So. Africa. You'll have to get in touch with them to see if they still do it, I haven't seen it advertised in awhile. They thought there was sufficient market for a fully assembled car, but, I think, misread the rod side of things. Speedway Motors' Signature Series '32 Highboy | Street Rodder Magazine Article at Automotive.com