Still trouble!
I have a new Carpenter clutch fork, C5OZ-7515-A which seems to be the closest I can get to original spec. But there's a problem. I have installed this into the 5-bolt bellhousing, and the fork ends are too short. It is correctly mounted to the pivot with the hairspring. I have measured the position it will sit in on the input bearing collar when in operation, and with the top retaining spring clip engaged the lower is not, or vice versa. The un-engaged clip prevents the clutch arm from moving back properly from the clutch diaphragm fingers and the release bearing binds. Photo in the correct working position:
I still have the old clutch fork from my Mustang, a '68 with 6-bolt 289, 3 speed toploader (original trans, can't verify clutch fork but likely original). This has a different rod spring mount, but has longer 'fingers'. Pic of the two together, with the pivot points aligned, new C5OZ on the left:
So, I guess I have to go with the longer Mustang fork. I don't have any part numbers for this. Anybody have any idea what's going on here? Something different about a 5-bolt bellhousing pivot point (but the Mustang one's from a 6-bolt)? Poor pattern parts - although the Carpenter piece has a Ford sticker on it with a Ford part number?
Really confused