As far as build up parts for these engines go, MoPar springs install without machine work, there spring pressures are listed in the book, "Engines."
I do not think spring pressure will be an issue for most builds. You can match the cam's pressure requirements with the MoPar springs.
IIRC, the MoPar roller rockers are Crane. Do so correct me if I'm wrong though.
The heads can take the 2.02/1.60 or greater valve should the need arise. Porting a 302 head can go far, for a 318.
Your performance is compression ratio limited, as Prine has solved .... with ease, should you want to follow that path.
Which leeds me to you Mr. Prine, where did you get that nice little set up?
I want one.