hi i have a question about heads for the 350 my stock heads are 76cc block code is 3970014 my heads are coded 333882 just wondering if these are the stock heads the type of 350 i have only produced 8:2 compression ratio but figuring out bore and stroke and the cc's im figuring out now thats its around 10:5 could anybody shed some light on this for me i have a chance to buy a set of heads that are 67cc just wondering if its a better set up then what i have thanks!!!