318 question
I’d run with a small cam and headers to what George Jets suggested. I don’t like the stock 302 heads for this.
Depending on what head you stick with would help direct in a piston change. Kieth Black has two styles of Hyper and forged pistons designed the same in a flat top and a dome.
The same goes with the camshaft. I’d stay with a hyd roller and reuse the stock roller lifters for sure. I’d look at a intake duration @050 around 215-218*’s.
Other things like, will you use headers? What trans and gear ratio do you have as well as tire size? Cars weight?