They have several "shelf grinds" that work well with stock heads. Not sure on the cost off the top of my head. The flat tappet hydraulics should be about half what the hydraulic roller set up was.
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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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