All I know about RPM trans is they build the Tranzilla, which is the baddest of the bad. I don't know if that's the guy you talked to or not, but he does build some awesome stuff. I think to figure out what you need you need to tell us a little more about what your doing.
If your gonna drive this thing alot on the street - I'd say consider the T-56 Magnum, or getting a divorced bellhousing TR6060 (I'll look up what shop it was that was doing that).
If the car will be seeing street/strip duty, I'd say get a built T-56 or T-56 magnum
If the car will be seeing sub 10 sec passes at the track - maybe you wanna consider a face plated T-56, it won't shift smooth on the street or sound too pretty, but it's almost unbreakable.
Like I said, it depends on what you wanna do.
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