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I have a 393 with Duraspark, Speed Demon 750DP, Mallory HyfireVI and vac advance. Here's the way mine runs best:
20 degrees at idle, 36 at 3000RPM, 46 with the vac advance hooked up at 3K. The Crane recurve kit works well.
I ran without vac advance for a while, but the mileage was killin' me. The vac advance adds about 25% to my mileage.
Too much vac advance causes a high-RPM/light-throttle misfire.
HTH, Ed
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