Here's the thing.........
"Nobody" knows where the OP seems to get his so called information
he doesn't even know that I'm not a Dork nor does he know that I do not have a 273 powered vehicle, NOR am I trying to impress the world.
He CERTAINLY does not seem to know that the 62--63 would not involve 426 hemis.
Otherwise, it's just talk.
So if you are gonna "START" these, start with a SOURCE. Go find an old road test. Go find where someone that WAS someone actually ran these and quote THAT. Or find some old NHRA etc records.
And last, I don't need you to advise me, OK?