Oil pump drive shaft question

The pump shaft OD is .485 (measured with a mic and a caliper) If you drive the bushing in and ball broach the ID then you should be good to go. Ball broach would be a .485 diameter ball on a shaft that you can tap through the bushing. They have these for valve inserts so I figure they would work as well on a bushing. A spec I saw for a bronze bushing up to .750 is .0005 clearance. A 31/64 drill bit @ .4844 ran in reverse on a cordless drill at a slow speed could ream out that hole pretty freaking close. Then follow up with a expanding ream to .4855