How much is he asking for?

Looks pretty on the outside but is rough from the description. None of the photos show the worst items (floor pans, shock towers). You are looking at a huge " some assembly required" project with significant rust issues. So you face a couple of daunting issues with how bad is the rust really (unknown until completely disassembled and exterior paint checked or better yet removed) and "Are all the parts I need really in all these boxes?" The current owner has done you a disservice by partially disassembling the car as you were not able to document how things were installed. This will make reassembly much more difficult if this is your first FGF project. There is the issue of the car being far from original so there is no collectiblity factor along with a lot of custom touches for taste that were done like the Camaro rear spoiler, aftermarket painted mirrors and small, wide tires and wheels.

My opinion is that you are looking at something that will take a long time and a lot of money to be back on the road again. More of each than I would be willing to invest unless I had a lot of both at hand. Depending on your skill level you are looking at investing 2 to 3 times what the car would be worth when you are done, so you really need to want to keep it forever.