>>1149664The J4000 only weighs a few hundred pounds more than the J10.
>and the motor when it was stock made 395 ft lb torque and 295 hpNo, it didn't, the claims from that era were gross horsepower at the flywheel with no accessories. A 360 with stock heads/cam/CR is never going to get more than 250hp to the wheels on that truck no matter what you do. It's a good engine, but not what you seem to think it is.