273 Pilot Bushing/Bearing Problem / Fix
Don't know about 273, or other SB, but be careful of the DEPTH as well. This is a problem I ran into "in the seventies" with a 440 / was automatic. I pulled the crank and had it drilled.
Many "back then" advocated chopping 3/8 or so off the 4 speed shaft, which I did not want to do