Hi I have a 66 Mustang that has a Dart iron block in it. the car badge says 289 but i dont think so because it has 4 bolt crank mains. Ive just pulled the heads off because of a head gasket fault and the casting on the head says 289 but Dart didt make a 289. Bore is roughly 4 inchs and stroke is 85mm or 3.346 inchs i think it might be a 351 or a 347 stroker. 351 had a different firing pattern than standard they were 13726548 and mine has the std 15426378.
Can anyone help please