My shop manual says nothing about sealer on the threads, but I always coat them ever-so-slightly w/ sealer. It does say that on all motors, the oil inlet tube should be mounted to the oil pump at 12-15 ft.-lbs. of torque. I don't remember how I was able to do that w/out using vice grips on the oil inlet tube, but I wouldn't advice it - you can bend and pierce it quite easily.
Doug
'66 signal flare red coupe with styled steel wheels
289 4bbl. w/ power steering, brakes, and A/C
White interior with a bench seat, deluxe seatbelt option, and an extra seatbelt in the back for my three kids . . .