Help with building a bit more power in to the 318

Yeah I thought of the 390 at first but noone seems to build them and i figured it must have a reason?

Only cause most have access to a 360 and well..stroker pistons are cheaper for the 4'' bore than the 3.91 or 3.94, 3.95 etc....

If all I had was a 318, I'd build a 390 something cid in a heart beat.

Thats still a lot of inches and built right would smoke a lot of other motors out there.