One observation on compression ratios: people do a macho growl/grunt about using a 1956-1962 235 "848" head on a 1958-1962 261.
It looks like that change gets you a 3% increase in compression ratio?
Maybe a member who knows engine specs/performance will comment on the value of having drilled and installed a sought-after, hard-to-find without cracks, holy grail (and, relatively expensive), "848" head in order to obtain 3% higher compression
(besides, of course, the macho/bragging grunt/growl value).
By the way, I would use the "848" head for conversation-value (If I had a spare "848" head).
