I'd look for one with fuel doors (76-77) instead of caps sticking out - I think they look better, and they have front discs and generally better running gear - of course, they're more expensive for those reasons and because they're the newest. But they use most of the common repro parts, unlike the REALLY early ones (66-?68). I built a 75 you can see at webphotos
by entering "steve" in the "Email/Nickname" field and selecting the "75 Bronco Redesign" album, and the main thing that annoys me about how it turned out is the fact that the fuel caps are exposed. (Other than that, it's PERFECT![img]/wwwthreads_images/icons/laugh.gif[/img])
The Dana30 front end is to be avoided, as are automatics (because the steering columns are crappy), non-electric wipers, and rusty door posts (they're SUPER expensive to fix right).
Plusses would include the windshield catch on the hood (not that you'll ever use it), all weatherstripping having been replaced, uncut wheelwells (so you can cut them[img]/wwwthreads_images/icons/smile.gif[/img]), factory A/C (you'll never find one, but...), the Ranger option package, a good headliner, good seats, dual tanks, and I can't remember if the "T" or "J" shifter is better.
Other useful suppliers include Advance Adapters, Auto Krafters, B&W Auto Parts, CBS Performance, Energy Suspension, Daystar, Dennis Carpenter, James Duff, Jeg's, K Bar S (you haven't SEEN expensive!), Klune-V, Mac's Antique Auto Parts, Midland Automotive, Obsolete Ford Parts, Rhino Linings, Summit Racing, Tom' Bronco Parts, Truck Accessories for Less, Truck Add-Ons, Truck Performance, Tuff Country, West Coast Differentials (excellent warranty), Wild Horses, and 4-Wheel Parts (some people hate this one).
83 Custom w/95 4.9L EFI, 78 NP435, 83 NP208, 83 D44IFS 3.07, 87 Ford 8.8ABS 3.08, Michelin LTX AT 31x10.50R15