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I just looked up the information for your distributor, it has an adjustable spring weight driven advance plate that can be adjusted from 0-28 crank degrees.
According to the literature with stock springs the advance starts at 1500 rpms and is complete by 3500.
I don't understand if you are able to adjust the JBR distributor base, like the original, to adjust the initial timing or if that can only be done within?
If you can adjust the base to say 7 degrees at idle than that leaves you another 28 degrees of advance internal. That would be 35 degrees total. It would idle smoother and you might get a bit more pep at top end.
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78’ SC 911 Targa - 3.2SS, PMO 46, M&K 2/2 1 5/8” HEADERS, 123 DIST, PORTERFIELD R4-S PADS, KR75 CAMS, REBEL RACING BUSHINGS, KONI CLASSICS
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