Hey everyone! I just picked up a distributor, ignition box, coil harness ect. from a junk yard to swap into my 86 F-150 with 4.9. I didn't realize it at the time, but the ignition box was the high altitude type. it had a yellow connector. I have since found a box with a blue connector. The question I have is: Is this distributor different from a "non high altitude" vehicle? It has a yellow advance spring in it.