1st Gen Crew Cab Engine

I still say 440. You can find and buy a whole motor home for less than $1500. Everything you need is right there- battery, alternator, pulleys and brackets, carb and linkage's, even the 727, usually with a drum style e-brake hanging off the back.. Power steering lines, motor mounts, and radiator may or may not fit, but are easy to fix, drive shaft can be modified easy enough. Exhaust down pipes and manifolds should work. You cant beat buying a motor home for a donor vehicle. They are designed as low compression torque monsters=Cheaper Gas. After all that the motor home will scale out for 4 or 5 Hundred Bucks