302 casting potential?

The right head is best on any engine. That's really all you need to know. The rest is mostly opinion as you'll find many people with many different head combos that all make power. I think a 318 w/302s is a good base for a performance build. but once a certain performance threshold is needing to be crossed, other factory heads can do the job as well or better. I'm pretty sure BJR's got a bunch of stuff on his website about them if you want details.