You mentioned that you would prefer a manual set up. By that I assume you mean 5 speed or 6 speed manual transmission.
I just installed a Tremec TKO500 in my car this spring. It is an easy & reasonably priced swap & the results are great. (Although I do need a bit more rear gear now, but a new rear end was in the forecast for this winter already.)
Contact Classic Chevy 5 Speed, ask for Jim & tell him McGoo sent ya.
Paul
