They say that it will not be accurate due to the multiple spark system with MSD. Reading the tech information the MSD is down to one spark per cycle at 3000 RPM or greater. I played with the MSD advance springs until I got the best advance curve for my car. I then get the engine to 3000 RPM and adjust the timing with a dial back light. My engine is a 61 389 Tri-Power with the old style iron heads. I have found that 31 degrees runs well, and doesn't ping. Try that, and then adjust to the happy spot for your engine.
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If you built it, drive it.
red 62 Tempest total stock restoration.
white 62 Tempest modified, 61 389 Tri-Power, and a conventional drive train.
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