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ON MY 69 MACH1 I USE SUNOCO 94 WITH THE 100 ACTANE RACE GAS, MY TANK IS I THINK 20 GALS SO I PUT IN LITTLE OVER HALF WITH THE 94 THEN THE REST WITH THE RACE GAS ABOUT 10 GALS BECAUSE MY 408 STROKER PINGS A LITTLE TIMING MUST BE UP HAD IT TUNED BY A RACE GUY PLUS I HAVE 2 LIGHT SPRINGS ON THE DIST CURVE , SHOULD I HAVE PUT ONE LIGHT AND ONE HEAVY INSTEAD OF 2 LIGHT HE SAID IT WAS COMING IN TO LATE WITH THE CAM, COMP IS ABOUT 10.50 64CC HEADS SHOULD I JUST GO HALF AND HALF ON FUEL OR CHANGE SPRINGS. THINK MY TOTAL TIMING IS 36 DEGREES HAVE TO CHECK IT WHEN I BRING IT OUT OF HIBERNATION LIVE IN NJ THANKS.