Holley 2280 throttle bushings

It looks like McMaster Carr has 5/16" shaft bronze bushings in various diameters and lengths. I guess
i will take the throttle plate off and take some measurements and see if they will have something that will work. I'd be interested in any tips from folks that have done this before. I was going to use a drill press vice to drill out the shaft hole in the body for the bushings.
If there is enough meat on the throttle body the smallest bsuhing diameter is for a 3/8" opening. The actual bushing diameter is .376" so if i use a 3/8"(.375") drill bit the bushing should be press fit into place.