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I dont see 350 N/A horsepower with flat tops, unless your possibly using 58cc heads to get the compression up closer to 10:1...maybe 64cc heads... but either way. your also going to need more than a Performer intake.The Performer is good to 5500 RPMs, your gonna need more RPM than that Id consider the Performer RPM, or Weiand Stealth.
Depending on what heads you have, itll take more than just a 3 angle valve job, by the time your done spending money on 2.02/1.60 valves & porting, might be better off with aftermarket heads.
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