Plenty of good information here. I second the opinion that you would be better off using a '58-60 bellhousing which would allow you to use any GM 3 or 4 speed from that date up to the 80's or even an aftermarket 5 speed with the GM bolt pattern. My '57 wagon has a '59 389 with a '58 bellhousing and Tremech 5 speed. You can use your stock driveshaft with a 3 or 4 speed. The 5 speed requires shortening the driveshaft.
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1967 Firebird 400 ragtop, auto
1957 Chieftain Safari ,2 doors, 3 deuces and 5 speeds
1972 Olds 442, 350 , auto, survivor
1983 Buick S&S Hearse, cheap transportation and parts hauler
1967 Buick GS 400 4speed
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