I've decided against the '69 windsor heads and have now found a great deal on a set of 351C 2v heads. They have already been machined to fit on a windsor block. Does anyone know what mods are necessary to make these work? Do i run a cleveland intake? Do i need to worry about valve clearance? By the way I'm working w/ a stock 67 c code w/ 3 spd man. Any idea what sort of compression ratio i would be looking at? Would i have o geta different set of headers to fit as well?