I understand how everything is measured. I was only going off of the paper I got from Speed Pro. Again, they claim their 383 piston (don't have their part # in front of me) with 64cc heads and zero deck will produce 10.0 compression ratio. It does not mention head gasket thickness so I would assume that's with an oem gasket. I was just mentioning the information I have to try and help. If you feel this info is not correct, do not attempt to try it. Like I said I was just trying to help a guy out with information I feel was legit. I will read those two links in their entirety as time is available. Seems they may be quite valuable.

Jason