For a 393, I would rather use an old 69-74 block and run a solid roller cam. And a flat tappet cam is fine for more mild conditions. I am not knocking the flat tappet by any means (I have one myself) and they certainly don't get the credit they deserve. But why build such a beast and put a weenie bumpstick in it? Just my .02.
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The sig says it all.
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