[73 Mustang Boy]

Seems like no one else has a clue so I can give it a try. First, did you replace the points and set the gap correctly? If not I would suggest dooing this first and go ahead and replace the condensor too, it will be worth it. Try setting the timing at about 10 deg. then test it and change it a few degrees and try again. There is no real set number for timing each motor is diffrent, you just have to expiriment. As for your gas mileage, Ford FE series motors are gas hogs to begin with. 6-8 mpg sounds right if you are "stomping on it comming out of a corner" as you explained. I would not expect more than 12-15 mpg out of that truck under easy driving and a good tune up. The vacuume readings you took are they manifold or timed vacuume? How many miles is on the motor(aka how bad does it need a rebuild)? What gear ratio does the truck have? (4.11's are not good for gas mileage). I hoe I could give you some ideas on what, if anything, needs to be done. If you have any more questions just ask and I will see what I can do.