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I have been planning this build for a street 1971 Demon with a few passes down the 1/4 about once a month for fun. 360 + .030 stock crank and rods KB 107 pistons, zero deck 71 360 j heads 2.02 in 1.6 ex, gasket matched eddy air gap intake 750 DP 3.91 rear end question is this...

Gonna be building a 450hp range 360 soon. I currently have '71 360 J Heads with the 1.8"/1.6" valves(rebuilt about a year ago) on my 318. What would be better to do? Buy some aftermarket heads like Edelbrock Performer RPM or Indy heads......or have these heads rebuilt for the larger...