Update - ended up finding a rebuilt 318 that had some performance upgrades done to it. Supposedly, it ran great in a 71 Dart. Mild cam, 30 over, 1970 340 heads and intake.

Finally started taking the old engine out yesterday (instead of watching the NFL). Hope to have it back on the road by the end of the week for my son. Ordering headers for it this am and should have them here by Wednesday.