Russ, the xs282s cam is a real revver in a 383.
IMO, it's really a bit big for the rest of the plans for the OP's car.

Although, a small mid-230 solid single pattern on a 108 would likely do everything better than the xe274.

68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123
Dealer for Comp Cams/Indy Heads