Francis,
This is a really cool build with good timeslips.
I would like to try it in the DeuceCoupe Gonkulator computer, then maybe see what more cam might do.
Unless I missed it can you say:
* What CID (270, 302, etc)
* What exhaust (headers, pipe diameters/lengths, mufflers, exhaust if any)
* What tires
* 60ft times (and 1/8 et/mph if you have it)
* Also I cant find the bore spacing on the GMC (assuming its same 1939-1962) would you know that too?