Ok, I used a calculator on KB-Silvolites web site. With my pistons having a 1.84" compression height and sitting .020" out of the hole, A common Fel-Pro gasket (.040" thick and 4.180" bore) my heads needed to be milled to 60cc to reach the 11:1 compression. That get me closer, but seeing that I dont know what CC the heads were and what the deck height was to begin with I'm still peeing in the wind.