Thanks...excellent points. You are correct in that I did use both Summit and KB's web site calcs & came out with diff answers, which got a little confusing. Now I know why.

So if I heard correctly, using an 0.020" to maintain quench, and assuming chambers are somewhere between 88-93cc, I should be under 10.0:1, and with the high duration 509/292 cam, at low/mid rpms (low/mid compression)I might be ok on pump gas or a mix... provided I maintain cold intake charge/cool engine temp, possibly richen the mixture or worse case, retard total advance be a few for hi rpm.