Dear Dan;
It just maters what size belt you want to run.
I ran my 216 (wide belt) balancer on my 54 261. So don't worry, they all interchange.
Just put your water pump pulley (1950 )on the 'short pump' that Patrick's sells & it all will look stock. Same belt you were using too.
You don't need a rebuilt.
Good luck, John M...
