when i bought the engine from my buddy, he did have adjustable rocker arms, he put back the stock rocker arms when i bought the engine, however he did run the engine, he sd he had no problems, he had a eddy torker intake, headers, 750 double pump holley, the adjustable rocker arms, msd6 ign., i have 750 holley single pump, performer air gap intake, headers, and stock elect. ign, with stock ecu unit,and stock rocker arms, do you think i need to change to his set up?