Personally, i'd go with the 750 dp, you'll still need to jet it properly though but they do pretty good out of the box.i put together a brand x small block with ported stock heads, low compression pistons,performer intake,small tubes, way to big a cam, and the 650 dp worked great , but rejetting it worked way better. that motor did not put out anywhere near 500 hp.usually a 650 is rated to perform well under 500 hp.
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