I was told decades ago, "the engine will tell you what it wants". If you trust the dyno and the timing light they were using, than 35 degrees is what this total combination wants to run it's best. I agree that using this number and taking 2 degrees out is a nice little safety cushion if you don't have any type of detonation sensor system. Have never seen an engine ruined by running a couple degrees less than optimum timing. Couple degrees too much advance, damage could happen.
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