For simplicity, a TH350 would be great. I have run TH350s behind mild 396/402s in the past with no issues.
As far as 700R4s, I am not a fan. The clutch packs in them are tiny. A clutch plate from one will float around inside a clutch plate from a TH350 or TH400 because they are so much smaller in diameter. (Less surface area) Just my $0.02
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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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