Buying 89 turbo supra

Hey i am new to the supra. but i am in the proces of buying a 89 targa top turbo supra. The car has 74,ooo miles and it is in mint condition in and out. It runs great only one owner. It has a turbo back 3in greddy exhaust, cold air in-take, intercooler, hks bov, greedy manuel turbo boost control and turbo timer, fuel presure regulator, and aftermarket boost and air/fuel gauges. Also a metal head gasket and arp bolts. and simple stuff like system and headunit. The guy was asking 8500 i talked him down to 7500 am i over paying or is it a resonable preice.