I've got a 1987 Grand Marquis 5.0L EFI. I heard that there isn't much difference between the Grand Marquis 5.0 and the Mustang 5.0. Fox body Mustang parts are plentiful and cheap now. Is there anything off the old Mustangs that I can bolt on the Grand Marquis to help out the performance? I know the air/fuel and the intake/exhaust are pretty restrictive, I mean how else can they choke down the 302 to make 140hp and 170ft/lbs of torque in my car. I just installed a new .040 over short block, had my heads rebuilt, and got a lot of other new parts that go along with a heart transplant. The car has almost 200k miles on it, but was very well maintained. (family car) I just want to get some more power out of it. I was thinking about replacing the injectors, and someone said I could just bolt on a 5.0 Mustang MAF sensor and that would free up some more hp. Please give me some suggestions. I just want to stay pretty bolt-on, I don't have the tools or the money to get too extensive. Thanks for your help.