I'd start with the body work first. Personally, I think it's the most tedious and time consuming if you're detail oriented.
I collected a lot of parts while doing the body work over the course of a year for my Mustang. I saved a ton of money just by being patient and buying things when I saw a good deal. I'l do my FB the same when it comes time.
Post some pics of your ride.
1967 FB 400 4-speed A/C Tyrol Blue w/ Dark Blue 1967 GTO 400 AT A/C Gulf Turquoise w/ Black (dad's 1st car, my last car)