"The shop says I didn't prime the engine long enough. 10+ minutes with drill @1500rpm. untill oil was coming out all pushrods. THE SHOP says it takes at least 30 minutes to prime a SB chevy."

HUH??? Somebody's confusing priming time with camshaft break-in time. All you need is to prime the motor until the drill motor revs pull down from the load of pumping the oil and that doesn't take but a few seconds. They may be talking about the run-in time, which requires revving the motor to...oh...maybe 2,500 rpm's (so the lobes get a good splash lube) for about 20 minutes with a good load of molybdenum disulfide in the engine oil. If you didn't do that, then that explains the cam failure.