Well your 512 timing thread did take a left turn into fuel milage and cruise circuit tuning but I was not talking about fuel. (Although I never heard of changing the transfer slot- why would you do that when you can just alter the mix going to it with the ifle feed restriction and air bleeds?)

I was talking about taking a stock distributor and welding/brazing the slots in it shorter so that you can run less mechanical advance as in 24 at idle and 34 at wot. Combined with spring & vac pot selection and limiting you can dial it in pretty decent. If your motor wants a lot of initial you’ll still need a retard box to start it or a starter button separate from the ignition switch (get it spinning then light it off) to avoid kickback or slow hot starts. The hyperspark does all that for you but there are cheap ways to DIY that just take some more work.