4 Speed thrust clearance .005" to .009"
Hydraulic Flat tappet, Comp Cams 12-242-2 or 12-246-3, after more of a lopey sound, 12-600-4 or 12-601-4 Muther Tumper cam.
Stock Volume pump is fine for Street use.
Gear drives I would stay away from, I would stay with a good roller timing chain.