pilot bushing??

So it turns out that I probably have a crank that wasn't prepped for a 4 speed and that the bushing I removed from it was made to fit and the hole it came from isn't exactly centered in the crank..Brewers suggested maybe I could have the bushing I bought to fit the crank register cut down to fit the smaller register on my 65 273 crank...Ok, willing to try that, but yesterday I had seen a post where someone had actually given the 2 different crank register sizes and now I cant find that post again.
Does anybody know the size of the earlier(pre 68) crank register dimension so I can get this bushing/bearing cut down to fit? I have been looking for 3 hours now and can't find what I found just yesterday. I believe it was slantsixdan who posted it, but not sure.
Thanks for any and all the help here.