I want more Hp for my 318

That 670 carb is a vacuum secondary carb, its not too big! I ran 650 DP with great results on my 318.

Its camshaft and heads holding you back / plus those stinky little exhaust manifolds if you aren't running headers. (oh those wimpy valve springs have to go too...might as well throw some 360 heads on with fresh HP valve springs) My little 318 with a 224 @ .050 cam sees 6500 rpms each day its on the road.

The SB mopars are really neat were the intake can stay on during a camshaft change. That be my first to do list / along with some headers. What gears are in back?