1. Check the shifter to make sure all the gates work and determine if the 1st to 2nd shift is really notchy. (skip shifting will cause you to get locked out of gears depending on which gears they are skipping due to damage to the synchros) (AP1, AP2)
2. Check the oil drain bolt and make sure that it's the OEM bolt w/washer and that the pan is not leaking oil.
3. Check the diff bolt and make sure it's the oem bolt with washer.
4. Check the slave cylinder bolt and see if the blue powder color is on the bolt. If it is no longer blue, most likely the clutch delay valve has been removed. (AP2)
5. Reverse slowly from park and listen for a "click" or "tick" sound from the rear axle. If you hear it, most likely you will need to remove the axle nut and replace with a new one.
6. Check the crossbeam in the enginebay UNDERNEATH the OEM airbox. If it's bent on one side, it has been boosted by a Comptech Supercharger at one point.
7. Check the oil pan, if the pan has been tapped with an additional outlet/drain it has been boosted by a Vortech Supercharger at one point.
8. Check the crank pulley and see if it has holes around the edges. If so, it is a OEM crank pulley modified by Comptech for the supercharger pulley.
9. Check the inner/outer CV boots for wear and tear and if they have been replaced/maintenanced. Vibration at speed is known to be because of the inner CV joint being worn down. This problem can be magnified or excelerated by someone using wheel spacers or incorrect wheel fitments.
10. Check the hood line when it's closed to make sure its even on all sides.
If it is not, it has been replaced at one point or another by another hood. Also lift the hood and check the hinge bolts for various markings which will show the hood was taken off.
11. Check the rubber exhaust hangers underneath and make sure they are all there. Missing hangers could mean an aftermarket exhaust was used.
12. Check the soft top striker plates and make sure they are in fairly good condition. When the top is closed and the latches are in place, there should be no movement. If there is movement, you will not have a good seal when you are at high speeds. Something you would not necessarily notice on an inner city test drive.
13. Retract the soft top and make sure the frame is not damaged or bent and it folds correctly.
These are just a few I would check.
Great cars... which is why I own one.
Good luck!
Tim