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I have the same engine, had the same ignition set up
Jack, I have a 385HP FMS crate engine. It had the Duraspark distributor and the FMS/MSD ignition box. The distributor was not worth the effort to recalibrate and I wanted an adjustable curve. I installed a small dia MSD distributor and 6AL box.
Wanting as much initial timing as possible and limiting to 34 degrees, I tried to keep the vaccuum advance module for more MPG. The vac line was connected the ventra port on my 4150 DP 650 carb. I could not find a way to limit the travel of the vaccuum module (degrees) so I removed it.
I now have about 15 degrees of initial timing and installed the 18 degree bushing in the MSD distributor. It works great.
Mike, I would love to know where to get a vaccuum advance module for an MSD distributor where you can adjust the travel so limit the number of additional degrees. Most on the market allow you to change the rate of travel (degrees) by changing the spring resisitance against the vaccuum diafram.
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