10.5:1 Pistons for '66 273 Block w/ '67 920 Heads

Before you go too far, check this FABO thread out. It has definitive compression height data on the Egge, Kanter, and TRW 273 high compression pistons. Looks like the Egge's are the lowest compression option.

http://www.forabodiesonly.com/mopar/showthread.php?t=199120&page=3