Honestly, there isn't much performance difference below 6500 RPM. An LS1 converted to flat tappet placed 2nd at the engine masters challenge a few years ago. The break in process isn't as big of a deal as some people make it out to be.
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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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