I'd start over and take off the pass rocker assy, set a clean rag over the pedestals and take out the inter shaft and drill prime it (CCW) while a helper SLOWLY turns the crank CW w a 1&1/4" socket and a breaker bar as you man the drill and watch for the rag to get (hopefully) soaked. You need the rag or you will have oil in your face and on the car which will spoil your joy at discovering that it is indeed (hopefully) oiling. IF NOT take off the pass head and drill horizontally into the rear of the head then countersink a slight bit down in the threads in the rear pedestal so you can drill down at an angle to meet the horizontle passage. Tap into the NPT plug in the oil passage in the top rear of the block next to the oil sender to feed oil into the rear of the head. That way you dont have to disturb the shortblock and when you take the head off you can check the head gasket for no obstruction and run a rod in there to check for a restriction if it is a straight shot. good luck & holler back w the outcome