Vacuum Secondary Conversion

340inabbody said
I can’t get compression numbers just yet as I have some reassembly work to do yet. But I can get that done early next week.I

I did plot my curve and recall it being very gradual to soften the detonation. I think I was all in like at 3500. This along with a slight retard did stop the detonation. But the cost trade off is performance.
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What makes you think you lost performance retarding the timing a little?

Fix what you have. You should have left the M1 on there and learned to tune it.

This “a double pumper isn’t good for automatics” is straight nonsense. You can get better performance with the DP and a VS carb won’t get any better fuel mileage if you tune it up.