sorry guy's i feel like the man in Hawaii who pushed the wrong button and caused a false alarm for a nuclear attack.when i reamed out the bushing for the push rod i never went all the way thru. unlike the man who pushed the wrong button,i will answer any and all questions you may have.
The replacement '32-'48 bushings are brass. Unlike the later steel.
When pressed in place they will swage down to a smaller ID and may or may not require reaming to accommodate the 3/8" push-rod.
I guy might be able to finish reaming it but it's going to be tricky with the cam in there. Turn the engine upside down in a stand and use grease on the reamer to catch the metal particles. The reamer would have to be the correct finish size with multi flutes and have a flat face on the end that goes in the bore. Ream a little ways then rotate it back out for cleaning & re-lube then repeat as necessary until through. Make sure the cam lobe is all the way down on the stroke cycle.