Magnum heads on LA block H.p increase

I read page 1 of this thread and about half of page 2 but I have done the EQ magnum head swap on a 318 LA in an 83 D250. Used a stock 360-2bnl cam very much a dead ringer for a COMP 252.
Untouched stock 130k 83 short block. Added a performer (not RPM) intake and 625 carb. BIG feelable difference in seat of the pants, towing or empty. Better mileage too. Would be even more noticeable in a light A body....