i have a friend with a 1990 351 windsor to put in his fox body stang he was recently given a set of heads off of a 302 H.O frm the late 80's this set of heads has a heart shaped combustion chamber anyways the point is can he use these heads on his windsor he has been told that the valves would hit the cylinder walls i was just wondering if this is true and if there would be any other problems with using these heads any input would be greatly appreciated.