The distributor man, you always forget the distributor. Truck is in Houston, soon to be on the farm 20 mile north of Texarkana. It's a little hilly, so changes in altitude are not a problem. Send me a PP email address. 84 Dodge W100 4x4, 318. My truck has headers...where do you suggest I put the o2 sensor? And my butt is not an option...lol.