Questions on a toploader transmission

[DanEC]

I posted this over in the David Kee toploader section but that area isn't getting much action apparently.

I found a 24 inch toploader small input WR toploader for my ERA and the tag is missing. It looks like it's probably from a 67 or 68 Mustang, Fairlane or Cougar. I found a yellow ink stamp on the side that looks like "6 M". It also has a "HB" date casting on the main case. Anything in this that narrows down what it came out of.

It has the long pilot bearing tip on the inut shaft that I understand I will have to cut back to use with a 428 motor. It has some wear in a band about 1/2 inch to 1 inch out from the splined section. The first 1/2 inch or so from the splined section looks good. Looks like the worn band has lost about .003 in dia. Most of this will be cut off when I shorten the tip and what is left will not be much worse than a gentle bevel on the tip. So, I'm thinking this probably won't be an issue - does that sound reasonable? I will probably put a rebuild kit in the transmission and if I need to replace the input shaft I want to do it at the same time.

Thanks

Dan