Well , if I had to start another restoration I would want to start with something like this. I can't tell you how much time I have spent trying to figure out what goes where. I too started with a basket case and have spent YEARS getting all of the right bits and pieces. I started with a total rust bucket 70 SCJ mach 1 that I have had to use for parts for my other 70 SCJ mach1. But neither car was very complete. I concure with one of the other replies in this thread , LABEL EVERYTHING you take apart, take pictures,keep notes. Take a flash light and look into the cowl area , if the rest of the car is that rusted you probably have a problem in the cowl area as well. I assume this is a 351 car , if it has a shaker this deal sounds even better. While rear quarter skins are available , front fenders are harder to come by as I here the repos fit like crap. Other hard to find body items are rear decklid ( 70 machs have no holes for mustang lettering like 69's do ) and doors, doors, doors. 69 doors will fit , but 70 doors do have a subtle difference in them. You might also check the front fender extensions , these quite often have the little tabs for mounting the front valance broken off. One thing you may consider is trying to find a rust free body ( not always easy especialy here in New England ) and use this car for a parts car. Even if you had to bail out of the project you could part out this car for more than you paid for it. Did you check the torque boxes ?? Well , let us know how you make out.
Marc
70 SCJ R-CODE MACH 1
88 GT