Welcome l
Your truck certainly has character.
Do you have any idea how long its been sitting?
it will probably be easier to get it freed up with the engine mounted in the truck but if it has been too long with water in it that may be a lost cause.
Jim,
Lil'Red is a '87 F250 HD, 4.10's, 1356 4x4, Zf-5, 3G, PMGR, Saginaw PS, desmogged with a Holley 80508 and Performer intake.
Too much other stuff to mention.