Your question is double sided. You say you bought the heads and then ask if you should run a Chevy Style Rocker or Shaft Mount. That decision should have been made at the purchase because the heads are totally different to run one or the other style rocker gear. The LA or Shaft mount is superior to the Chevy style "Magnum Head" set up and I believe most would agree with my statement. Cracked asked a good question. You did order the closed chamber versions right?? Can you Post up your part number.