Avoid the cast iron Saginaw 4 speeds at all costs! They are made of glass and won't hold up to much. Get yourself a Muncie - M20 or M21. Or, a Super T10 out of a 70's Trans Am, Corvette, etc. Make sure you identify the gear ratios in the T10, some of them have stump puller 1st gear ratios - but are weak.
I am with Ray, I would use the 327 and dress it like a 350HP L79 327.
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1972 SS 454 Chevelle LS5/M21/12 bolt 3.73 posi
1969 Malibu COPO L72/M20/12 bolt 3.31 posi
1968 Malibu LQ9/4L80E/12 bolt 3.73 posi
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