88 vert

hey i test drove a 91 vert today i already have a 88 vert and a 89 GTU the car has a few problems that i dont know about in both of my cars my oil pressure stays about 30 psi at idle and about 65 at 60mph this one only had 10 and max 35psi and it had a whooring sound like a turbo but it isnt the clutch slips and the throwout bearing is bad that could be making the noise the guy is asking 3200 for the car but im unsure of the oil pressure it has 134,000 miles on it.any advice? thanks,Dave