It's a beautiful car, and that price seems fair if everything checks out. The few minor discrepancies that I noticed are easily corrected (does nt have HD radiator for A/C car = replace, sidescoop grills wrong color= repaint, heater control vacuum valve in engine compartment= replace with correct valve, door grills are for Deluxe interior= they look good though- just paint black where speaker & interior light cutouts show)
I like the GT exhaust & valance (not originally equipped on non GT, 289 engines but I put them on my car also)
I don't know anything about the broker, but it shows a good customer satisfaction %. Nothing beats a personal inspection prior to purchase.
Neil