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Thanks for the quick replies. The plate is almost certainly on backwards, it all makes sense because the mounting holes only allow it to line up one way. I'm sure having the holes offset because the plate is on backwards causes the whole deal to be out of round and therefore vibrate. It's amazing the guy I got it from never changed it around?

I'm not doing anything crazy with the car just want a jump in and go cruiser, I'm most likely going to order the B&M 10230 and some new bolts. With any luck the flex plate was the weak link and it didn't rough up the crank or back of the block. Maybe I can even get to drive this thing before the weather breaks.

I wouldn't , and don't, use the B&M flexplates now do to some guys having issues with them vibrating(the externally balanced ones) and the converter bolt holes not lining up correctly I would either buy a new one, if you need and want a SFI spec. one for racing, or go to a tranny shop or junk yard and buy a good used one I have a dozen or more of all three sizes( 11 and 12 inch bolt patterns, small and big converter bolt sizes) and types(6 and 8 bolt crank flanges) hanging on the wall, to bad your not closer

Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)