Thanks Tom. I'll stick with 72 then. I have a upgraded metering block for the rear and will be looking to replace the 78 jets and go with 75 which was the equivalent (134-21 (metering plate)
Now on to the whistle issue!
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69 Gto, 390 posi gears,th400 w/jim hand converter/406 pontiac/#64 HEADS/ 10:1 compression/ 190 PSI with/ TRW 160 thou domes / hooker headers 1 7/8, PRW 1.5 rockers, 405 Crower Springs, Holley 750 vac with proform upgrade, Performer RPM on points / 284 H Single Pattern Crane
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