Without buying the correct tool, this is a very graceful and redneck way, in fact its better that the correct tool because you don't hammer it in. Worked great on my SBC350 build. The article calls for some iron plumbing pipe, which I didn't have, so I cut open and splayed a piece of regular 1/2" conduit. And assuming this is an internal/submerged pump, you do not need to pack the gears full of grease, so ignore that part (it is a common misconception).
(ran spell check to pass tech inspection LOL)
Install A New Oil Pump - Part 11: Rebuilding An Engine To Fix A Rod Knock - GMC or Chevy 4.3 V6