When you say hydro pump, do you mean a hydro boost set up? Like what Turbo Buick Regals had? And what the late model Ford Mustangs employ? It relies on the PS pump and fluid, no vacuum involved. 6-7 is horrible, must be a really lumpy cam with a lot of overlap.
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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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