MW ports on a 500 inch short block will give you a torque peak in the 5000 to 5500 rpm. Peak power is usually around 7000 rpm.

I don't think you'll see much difference between the SR heads and the -1 heads if they are both ported the same.

If you need new rocker arms I'd suggest getting the -1 heads machined for Jesel rocker arms right out of the box. The Jesel setup cost more up front, but it sure is nice to work with over time.

Dwayne is always a good guy to talk to on builds like this. He can set you up with the heads that you need and give you some cam suggestions at the same time.