I talked to Wings this is what he said about the truck .
The frames is a mid 70's Chevy dooley crew-cab pick-up, with all of the later Chevy underpinnings. Brakes, power steering, Master cylinder, etc. The rear axle is a GM 14 bolt from a 1 ton cab & chassis. They are much narrower than the dooley pick up's Dana rear. I widened the front fenders and running boards 4", because the front track on the new frame is that much wider than stock. The front bumper is custom made from stainless steel. Transmission is a GM Turbo 400, with a Allison torque converter and a US Gear underdrive. Rear end is 4:10 ratio
You may have cooling issuse. My truck has 3 radiators and 2 transmission coolers.
My truck has over 200,000 miles on it, pulling a 18,000 trailer. It works well. Build your 454 to run on regular gas, as it will burn plenty of it.
Good luck.
-Wings
