so you are saying that it really does not matter which size I use....its for my 71 GTX....

69 RoadRunner (clone)
70 Cuda 383 4 speed (project)
70 Cuda convertible 340 4 speed (project)1 of 88
70 Barracuda (project)
71 GTX 440 4 speed (project)
72 Cuda 340 3 speed (project) 1 of 25