[Steve Dickey]

Blykins,
I had much better luck with welding on the collars to locate the pins in the bellhousing. There is no problem with the threads on the bolts as the holes in the bellhousing are oversize. Just for safe measure, I would disconnect your MSD box. The closer you can get to zero runout the better. I would also invest a little time making a jig to hold your dial indicator. It is simple to do and makes the job much easier. If you send me your e-mail address I'll send you a picture.
Good luck, Steve