400 and purple cam

RustyRatRod said

That combo will probably need at least 20* initial. Maybe more. I would start at 20 and limit mechanical advance to around 16* all in by 2500 RPM. It may want even more initial, if so, you will need to limit mechanical accordingly.

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Asking a question here. Isn`t 36 in at 2400 a little too quick for todays pump gas? That's the way we used to run them when we had good gas. I`m running 21 initial, 34-all in at 3400. Is my thinking wrong on this, w/ 91 real gas ?? All opinions welcome !