You'll need the computer, engine harness, trans controller (if it's not part of the main computer) and related sensors and such. There have been a couple Coyote swaps done on 80s Broncos. They were quite involved.
Are you thinking of staying efi or carbing it?
I assume you have a 2wd truck? If you plan on using it as an actual truck, you might consider swapping the cams out for a lower torque rpm range. If it's a street machine, the current cams will be fine.
I have a similar "problem" of a totalled 2003 mach1 sitting in my driveway. The 4.6 4v and tremec 3650 5spd are waiting to get used in something. I've pondered a maverick, comet, f100, and even a ratrod. Some day I'll get it going!
1985 Bronco Custom- 309" inline six, np435, 4.56 gears, Detroit locker in the rear and Trutrac in the front. 12k winch. Onboard air coming soon
1996 F350 RCLB 4x4. 351w, ZF5, 35" swampers.
99 E250 v6 rust bucket. Daily driver on 33" tires.