Had a 400sbc 2 bolt main 509 casting in my 71 Full convertible Blazer that was just a beast! Setup right these things are nasty for being an iron block with no machining done. Slap a good set of heads, yeah the double humps can be pretty desirable for somebody doing a matching numbers car. I would say pull the heads and put em up for sale and grab another set to slap on there. Depending on what you want to put it in and what you want out of it power wise then obviously go from there. A good dual plane intake with a demon will go a long way.
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There is no replacement for displacement...
99 Camaro Z28 M6 - Sold Aug 2013
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