The next step

My 2 cents. Build a stroker shortblock as it will make you're goals easily attainable with room for more power depending on what you start with. Bought a 68 Dart race car roller myself earlier this year. Just finished my first 727 build for it. Working on a 451 now. It's a 400 block with a 440 crank cut to fit. 400 blocks are supposed to be a little stronger than 440's. Looking for mid-tens myself.