In need of some 273 head education

thanks for the advice thus far, I'm trying to do this cheap, so the way it appears is that i should just do a mainly stock rebuild and maybe a little bigger cam. It already has a 4 bbl and headers so i do have decent flow and fuel supply. I would like to know more about those higher compression pistons, however i didnt see any info about them on either of the companys websites. If you can get me a link that would be appreciated. And if anyone else has any advice i could definatly use it.
thanks again