Still Learning

"Just pick parts to make a good street engine. 600 cfm 4bbl, stock/performer or similar intake something like Comps XE262H cam."

^This^, plus a shiftkit in your 904 trans with maybe a 2200 stall converter. No need to upgrade to an 8 3/4 rearend if you have the 8 1/4 already under the car, there plenty strong for a 318 auto combo. I had a mild 318 build in a Dart Sport and it was a great running little combo.