i pulled the driveline so i could do the exhaust gasket to get the leak tsaken care of. drove the truck and it made a clank noise every once in awhile so i just said screw it and threw it back in. i'll just not worry about it right now. getting 33's saturday well suppose to anyway. so that will help with the power issue and speedometer. do the 4bbl intakes help power and mileage for this engine? an old timer told me it would a lot but wasn't sure if i should trust him. mileage is about 6-7 with the vacuum lines plugged.
