I run a set of 781's on my 454 and they are 120cc. So, I didn't need to look it up in this case. I also use a small dome to get it up to 8.75:1. Flat tops are the stock smogger piston in a 454.
I also have a set of 820's from a 73 402, and they measure 112cc. These are also good heads that would increase the compression in a flat top 454.
I heard the votec head will work on old BBC blocks, but I have no experience with those. I also read they are good heads and the low engine output from vortec 454 is due to the poor cam and intake.