I have a 402 BBC casting# 3969854 with the pad stamped T1222CLB. I beleive it is a 1971 Chevelle 300hp engine. It appears to have the stock flat top pistons in there that have one eyebrow on them. The engine originally came with 113cc heads. It now has aluminum 110cc heads on it. Any engine guys guess what kind of compression I might have??? Stock is 8.5?? Thanks.