I have one of those problom solver bushings as well. Only its a bushing not a roller.(ill NEVER use a roller bearing on the input shaft. Seen to many fail & ruin the inputshaft!) But the early small converter pilot hub wont let it fit. So it will need to be turned down to fit the small crank register of the 64-65 273's.
The pilot bushing thats .915 o.d. is for automatic un finished pilot holes. I just had to take a few thousands off it to get the proper ..003-.004 interface fit since my pilot hole is .905.
