what kind of performance gain would the offy 4 barrel and efi exhaust do to a 84 300 I6. i am running 3.06 rear and 30 inch tires, mainly i just want my truck to get to 70 before the end of the on ramp to the interstate.

 

You need to read the sticky at the top of the page on performance enhancing alternatives. Then you can ask specific questions if you still have any. John