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Ford beefed up the flex plate starting in 58 along with the improved Fordo converter. No change till 64.
I believe some 312 TBird owners have upgraded to that setup, you might check a forum out.
pcmenten, I don't have a clue as where to buy the 4 bolt 164 . I did buy one from a man on the list from NY for $100.00. I have one that has three bolts that hook up to the convertor on the Ford-O. The trans.I am using is a FMX which has four. the convertor is cruse-O. Looks like ever thing is going to work. There has been some that say you can just order at your local parts store. I or the man from NY haven't found that store yet. I would like to know for there is someone out there trying to do the same thing. Maybe they won't have to spend the time I had to looking. John