Hi.I am building a 53 4400 truck mounted on an 86 dually frame running a '74 caddy 500 and turbo 400 trans
The biggest problem is that the cab at the firewall is about 16" narrower than the late model. The steering shaft may clear the side of your small block(definately not on my big caddy) I will be using a chain drive unit by steer clear to line it all up.The frame has an angled kick under the seat location that I reshaped the floor pan to cover (my cab had no floor anyway) and because I am running the truck low the engine sits too high for the Hydroboost and master on the firewall.I am getting a 90 degree mount from Kugel that will fit it under the dash. My other issue is that I have to widden the front fenders by 2" to clear the front wheels because I am running low. Yours should be easier as it is 4x4 .good luck
