A modest body lift is a very nice addition. However I don't think it directly helps w/ the restorations process.
Having a little added room between the frame and body does offer more clearance for aftermarket transmissions, taller air cleaner that fits well under the stock hood, radiator mounts, taller tires, and other things...
The modest 1" body lift that wild horses offers doesn't really reveal the tell-tale gap between the bumpers and body that 2" or 3" body lifts have. That said, I'm running a 3" body lift on one of mine and aftermarket bumpers hide that gap nicely.
To get perfect body lines and the doors to work and align perfect a lot of work and patients is required to shim the body mounts as needed. Every Bronco is a little different and the fitment will be different.
Of course at minimum you'll install all new body mounts & fasteners during the restorations process. It is largely personal preference to use a body lift or not depending on your vision of stance, height, size of tires, transmission & engine used, intended use, ect....
And definitely secure the tub to the frame before cutting any sheet metal to keep if from bending or getting tweaked. You can mock up the doors and ck the alignment and lines before cutting into it. Having perfectly working doors is a pet peeve of mine and a common problem on a lot of "restored" Bronco's. Take your time, take LOTS of measurments....patients. The time spent now will directly reflect in the finished product....patients.