Small block heads

In terms of bolting on stuff, I'd say a set of 302s would be a decent help. The 340/360/318 4bbl heads have huge chambers. It's bad in a bunch of ways if there is no other work being done, we'll just shorten it to "try not to use them unless you do some homework". If he's thinking of spending the bucks on Edelbrock heads, he should spend the money on getting a shortblock that will be able to take advantage of the capabilities thye have. In your case, it's a waste of effort and money just bolting them on.