Nye's out of the three..
where do you live ?..if you were considering going some distance for your motor i like PAR Racing Engines out of S.C. ( Scott Duggins is the onwer)..864-578-5622...His 565's with oval port heads are makng right at the 1050hp range..and they running these things round,after round after round..with no problems and minimum maintenance other than the preventive norm....
just my 2 cents.
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Bjuice..
"I'M YOUR HUCKLEBERRY ! "