Ok, here's the situation: I have come into possession of a 1986 Mustang
convertible with a 3.8 and a 3 speed automatic. I have an '83 Mustang with a 5.0 and a 5 speed for a toy. (what can I say...I likes the old ones!) I have a Jeep Wrangler, but it gets very little in the way of gas mileage. That's where this car comes in. What can I do to maximize the gas mileage? Mechanic wise, I can turn a wrench. I have most tools needed, but I haven't dealt much with fuel injection. I know the 3.8's from that era were notorious for blowing head gaskets and the fuel injection was barely adequate. I have an 8.8 axle with 2.73 gears. I have a T-5 tranny out of a T-Bird Turbo coupe, which has a steep first gear. That way, I get decent acceleration from the stop light and keep the highway gear. I have a bell housing, clutch assembly, divider plate and starter from a '94 Mustang 3.8. Now comes the hard part: What to do with the 3.8? Reliability is very important to me and I don't mind spending the $ to make it right. I was thinking about swapping out the 3.8 for a '99 or newer 3.8. Has anybody done this? I know I would have to use the wiring harness and computer out of the donor vehicle. How hard would this be? Or do you have any other engine suggestions? How about exhaust? I like the GT tailpipes for that year. I have heard that you want to keep the exhaust pipe to a 2 1/4 diameter. For gas mileage, which is the better header, long tube, short tube, factory or? All help is appreciated. Thanks!