I put a little Loctite on the threads to seal them position the pickup where I want it, let it dry overnight. Then I tack weld the pickup tube to the pump, never had any issues.
Note to the OP
I would prime that motor before you start it again after your repair.
I dont use the drill method myself, I use a pressure system and run 5 quarts of oil throught the engine rotate the crank and verify that all the rockers are receiving oil.
Good luck and keep posting
Jim K