hello all, I have a 351w in my 67 mustang i want to put a 4 speed trans in the car.My ? can i use 351w factory manifolds from a 69/70 mustang in a 67 mustang and use the h-pipe from a69/70 mustang in a 67 car.I dont want to use headers i was sent over 2 sets for the 4 speed coversion both are useless.So i decided to go standard manifolds.thanks javed