How close is the correlation between cylinder pressure and DCR? I suppose going with a cam that has more duration @ .050 will be a little safer? 3 motors, 2 cams, still gotta buy one ( as the Comp 275DEH is kinda off the table).
Nb,T will have the best answer. We have a 72 Dart with a 360 that’s got mid 170psig at 4700da. 2.94 out back. It will run on anything at the pump. I’d speculate, 185-195 psig is the limit of 93 octane.