The upside for the 727 is the extension housing bushing there is only one for it. It's been the same since 1965. It is also the same bushing that Ford uses in the C6 since 1966.
Exactly. This is what my buddy found when looking into this issue. He had brand new parts and the clearance was still too loose.
If there is excessive clearance between the two parts, the only option is to either have the yoke plated and ground to the correct outside diameter, or machine a custom bushing. He is a machinist, so he made his own bushing. I asked him to do the same for me, as my car has an increasingly resonant drive line vibration starting at 98 mph and on up. It's dead smooth below that.