For flat tappet cam cores that fit a traditional B/RB or 59* SB Mopar with std journals.......I'd be pretty surprised if there was more than one or two places supplying cores.

Engine Power or Camshaft Machine.

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