I have had 2 304's
1. in a 1981 cj7, 3 speed auto, dana 300, 4.10 gears. 33" tires. was built up. the auto robbed the power, in my opinion.
2. in a 1985 cj7, 5 speed, dana 300, 4.10 gears, 33" tires. was blue printed and balanced. It was built. It went.