More efficient spark,more flame front,more cylinder pressure. If you curve that distributor,to 12 to 16 initial, 34-36 total at 2500-3000 ,sure would run better.
OK. Would you equate those characteristics to an increased burn 'rate'?
Your curve figures I assume EXclude any vacuum advance. Correct? With only 22º advance in the distributor, I think that's a safe assumption.
If so, why do you want to negate a load sensitive timing advance in a street application?
Yes, 12ºBTDC initial, 34º total @ 2400RPM with NO vacuum advance is what I ran at the track. My cam got me a pressurized intake manifold at idle, launch RPM was around 3500-4000RPM with shift points around 6500RPM....vacuum advance was useless.