I haven't looked at the tech sheets for those motors, but on most Mopars, the heads get superceded, so I wouldn't be surprised at all if the "302" 318 heads are legal.
Edit: I just checked the sheet.....looks like 302's are legal. I don't know if they're any better or not in that application though, but the better chamber might be worth something.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads