318 with a 4.00 stroke crank

Kieth Black, or icon as they are now called, has pistons for the 4" stroke 318. Eagle will tell you what bob weight they recommend if you ask thier tech people. I believe it comes out to be 390 cubes, and it should up the torque output quite a bit. I would use 360 heads as the 318 ports might be a little small for those cubes. 400 hp should be easy.