Rebuilt 402 big block with roller valve train, new 30 over pistons spinning on new rods with a new steel crank. Fueled by a FiTech 400hp throttle body. 308 rear gears being turned by a model #18083 Tremec TKX 5 speed giving me 17.5 mpg at 75 mph. Engine is so happy, and so am I. Liked the car before, LOVE this car now.