R3 Engine build Qs

Well I'm about to start Assembling my new R3 Engine, its the Retro 340 Siamese block # 5153478AB. It is bored to 4070 Scat lightweight drag crank, scat rods Diamond piston, compression came in at 11.25-1. Indy heads, Indy intake, Roller cam, T&D rockers 1.65-1, This exact build dynoed in at 675 Hp.
I am looking for input on choices on, push rods, oil pump, timing set / gear drive and I am looking for the best Race timing cover I can find. thanks Steve.