Slant Cam Specs deciphering

I’m a bit confused by Dan’s statement too. This is a bit smaller than a RV10

https://www.dutra.org/pictures/engine/erson rv10m-212-.jpg
I am, also. My 64 Valiant 170 cid, has the smallest MP cam, and at 9.5 to 1, I had a big issue staying out of detonation on anything other them 93 octane. It really needs more cam or less compression.