You say its a parts engine. Is there something wrong with it? Do you not want the whole thing because of shipping across the country etc? If not, I'd take the whole thing. You can resale parts, and or you never know when you need parts.
As far as parts: p-pump, lift pump, metal fuel line to fuel filter, any throttle brackets, pump mounting brackets, timing case, cover, pump gear, injection lines, inj line hold-downs, injectors. I think thats all you need thats related to the conversion. If it were me and you only wanted small parts because of shipping etc, I'd continue with valve covers, water pump, turbo, anything that can be unbolted... heck I'd take the whole engine.