Oil pump drive gear stuck

If it were me, I'd tap it in with a mallet and get it seated. See if it will broach itself. If it locks up the cam, then Id pull the pan and tap it out with a drift. Brass is not that hard. The drive itself is .4850 with the bushing area right under the gear at .4845 (on mine) so the broached size should be .4850 with mine showing .001 wear. Also the .4850 shank goes 3.6 inches below the gear then it tapers down to the hex for another 4.1 inches so if you can get it pulled, measure how far its going in before it hangs. Dont polish the hex, its not the friction point, just wipe down the .4850 shank with grease and drive it in.

Here is another post on the subject of not broaching it :"...well, thank a lot, guys. now i'm paranoid. i've installed hundreds of these things, and never had a problem with clearance or spinning. i use an unworn driveshaft to drive the bushing in, and then spin it until it spins freely. hundreds (i'm old). i knew of the tool, never never knew anyone who had it, so i always made do with what i have. i never did ream or cut the bushing. maybe that's why i've gotten away with it?..."