Great day at the dyno!

Sorry for the confusion - I misread a question.

My distributor is a factory mag-pickup from a 400 that retains the mechanical advance. Vacuum advance has been removed. The distributor was initially set at 10° advance at idle and total advance of 35° would come on at ~3500. This didn't matter because of the stall converter which locked up at ~4500 when racing.

With the timing bumped up to 40° advance, the idle timing is probably at 15° BTC.

At the track I shift at 6500.

Per the dyno graph, if you were to overlay the 35° advance plot over the 40° plot, there is a noticeable hp improvement over the whole "RPM" range. The dyno shop didn't give me those graphs, just what you see from above.