EVERY state is different on that and there is little continuity as to how they work the title thing.
I've found one thing when dealing with state dmv's you almost always are better off going to the top of the food
This I did find, Looks like a guy working in his home garage is screwed in Georgia when he has a salvage title vehicle..
https://dor.georgia.gov/titles-rebui...tored-vehicles
Actually it might be easier with the S-10 chassis and title and the salvage title for the body according to what I found here
https://dor.georgia.gov/assembled-an...ional-vehicles
While they can give you a ration about a salvage title from another state using a legally bought (you have the title) body on your legally owned (titled) S-10 chassis passes the muster for an assembled vehicle for what I read. AS long as you have the paperwork for other major components that prove you legally purchased them or came by them legally.
I'd be asking first though before spending any money or time on the rig. If you buy a donor rig for the engine or engine and trans and haul the hulk to the scrapper you photo copy the title of the rig and staple the paperwork from the scrapper to it to show you sold the hulk and gave them the title in the process. A good paper trail makes life a lot easier. If you have to hide what you spend on your truck from your significant other you can't afford to work on a truck and that comes from a guy who has been married for 47 years.