Borg Warner made a ST-10 that had a 3.20 first gear, which I think would be a drop-in replacement for your M22. That would work pretty well with a rear end as low as a 2.73. These were used in the 1982 Trans Am and Z-28s with factory 4-spds. I had a 1982 T/A 4-spd I bought new.
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