Usually a toe in will pull consistently to one side or the other, at least in my experience it has. I think they messed with your steering box.
Check your toe in anyway. Get a friend to help you. Mark the vertical center of your front tires on the rear and front of the tires. Make sure your parking brake is on and your wheels are perfectly strait (dont worry about the steering wheel). Then you and a buddy measure the distance between the front of your tires at the center line you marked, then do the same thing in the rear of the front tires. The front of your tires should be about 1/16" closer then the rear of your tires.
I do my own alignments and have been for a while now. If your measurements are where they are supposed to be then its not your toe in.
Complete rebuild axle/engine/everything swap in progress:
Parts already gathered for assembly: 2001 Ford 302, 1990 Mustang GT 5.0 ECU and wiring, NP435, NP205, Pair of axles from 04' F350 SuperDuty (Sterling 10.5 Posi rear, Dana 60HP Front-Both Disk Brakes 3.73 Gears), 37" H1 Tires, 9" lift TJ Coils for 2 link conversion in front, Stage 2 Clutch Kit, 3 Row Aluminum Radiator, Chevy Astro Steering box (4" front Stretch), XJ Rear Leaf Springs (6" Rear Stretch), and lots more.