Timing Chain oiler bolt

Every small block I have dissassembled from a 74 on up through 85 had drip tabs. I have heard that double roller chains destroy oil slinger rings. I will probably drill one for that purpose.

The oil gallery plug on the aft left lifter bank by the distributer gear benefits from a small #50 drill hole as well. It shoots oil on the distributer gear and shaft . Of course that lowers lifter oil pressure a little on the left bank aft end being farthest from the pump, and everything using oil up to that point. If you drill it out, make it real tiny.