Last night DV, Andy Wood and Charles Servidono had a live episode.About jalf way through they discusses Charlie's porting on the 318 heads for Mission Impossible. Heavily modified for sure, but they think those heads with a cam to run up to 8000RPM could produce 500HP. So the guys on here that say a teen is a toilet engine and that you have to have a 340 or 360 are full of road apples.
Now with milder port work and cam you should be able toeasily build 1HP/cube, which would run real well.