You could always attempt to fix the roof yourself. I'm no bondo expert by any means but that is one shitty bondo job on that roof.... Besides the roof the only other concern I would have is if the paint is ****ed or not on the rest of the car. That is a LOT of bird shit and I've had a few spots on my turd that left permanent marks. Idk what's up those bird's asses but it's like acid rain on our paint if left on too long. Which is exactly why mine is sitting under a tarp right now, as opposed to exposed to the birds...
Other than that, the car looks clean, the engine doesn't look like it's 100% bone stock. With everything else done to the car, and a properly fitted body kit (says a lot, believe me), I would find it hard to believe that he left the lower end stock. Get it on a dyno and you would have your answer tho... Hope it all works out for you man, that looks like a fun car.
Gotta agree with RZ tho, holy gauges lol