Pinging/Vapor Lock?

I can tell you how to get rid of pinging forever.
My 360 had 11.3Scr and 180/185 psi cylinder pressure, with that 292/292/108, at any installed centerline, and burned 87E10 all day everyday at 207*F minimum coolant temp. The secret?
Alloy heads.
In the end, I pulled that cam and sold it to a racer. It was just too much, for what I wanted to do.