What kinda bronco are you talking about,a first gen (66-77) second gen(big SOLID axled monster78-79) or late model(80-96)
A old blazer frame would be better,you can get one with a over drive tranny and fuel injection with solid axles.Its a lot of work,I help a guy put a k10 cab on a k5 frame and we had to do all new body mounts and chop and re weld the floor 2 inchs to fit the tranny and t-case in.(the blazer has been rolled though but still it was more work then I thought) If youhave a trailer(6x8 made fromangle iron) then put the body on that
A engine puller will lift the body problem(lifted my impalas)