Bearing Retainer Interchangeability

Ended up dropping the bell and taking it to a machinist to turn my original 4.3xx bell into a 4.8 compatible one....The other bell I had for for a big block and wouldn't fit my small block. I figured it'd be the same price and a lot less work hunting for parts just to drop it off. The machinist said he'd machine it so it had .002in of clearance. If it's good for him, it's good for me. I can always get an adapter from brewers if I need to go back down to 4.3xx for whatever reason.