Thanks for all the advice Guys,
The other thing I didnt mention is that I am planning on useing a T-5 and I dont know how this will work out. I do have two other power plant options one is a non running 235 looks to be a good builder and the other is 1978 250 that runs great the downsides to it are I would really like to keep my foot starter and it has the intergrated head but on the upside it is in great running condition and made to run unleaded.I think I will still get the GMC and keep researching all 3 options. I have plenty of time to make the powerplant deciesion as of my game plan on this project is to get all the body rot repaired first. Thanks again Aaron