318 build up suggestions

What are you looking for HP-wise?

The RHS heads are great, but maybe not necessary depending on what you're looking for. If you're wanting 300-350 hp, you could probably just go 1.88/1.60" on the valves and have your stock heads cleaned up (casting marks removed etc, no heavy porting needed). Or go with a set of stock magnum heads, they flow well enough stock to put you into those numbers.

If you're looking for more, keep the RHS heads, but I'd definitely go with a bigger cam. I know a lot of folks that run Lunati 60403's on the street, they're advertised Duration 268/276 (226/234 @ 050"), Lift .494/.513. With the stock heads even a 60402, with advertised Duration 262/268 (220/226 @ 050), Lift .475/.494 would be a better choice, and that's still a very safe choice for a street engine. I wouldn't even run the 60402 with the RHS's, just seems like a waste of potential.

Hyper or forged is another one for the "what do you want to do with this engine" category. If you're looking for a street engine and 300-350 hp, the hyper's will be great. Just make sure your machinist knows about the ring gap being different than regular cast pistons. If you want 400+ hp or are looking to do some racing or later upgrades then I'd just go forged now. But if all you want is a fun engine with "good street manners" the hypers will be fine.

And if you do stay with small port heads (stockers, 302's) you'll probably want to find a small port intake manifold, which the RPM air gap is not.