Just trying to get some experinced help. I have 1990 LX Mustang with a H.O. 302 its started overheating and excessive water leaking from the right exhaust. Would the the problem be a blown head gasket , cracked head or a bigger problem. Also I'm trying to build it up on the cheap side which would be the best to go with on a 302? 289 heads or 351 heads thanks