I guess you'd want to know all about those things "outside" regularly scheduled service and maintenance (have they been done w/in 150K?- if not, mostly like these will need attention)

>main engine wiring harness
>timing chain (stretched?)
>timing chain rails (plastic gets brittle & safe bet they need repl around 100K)
>rear hydraulic system flushed (nitrogen spheres may need replacement if flooded= harsh rear dampening/ride over bumps)

naturally the PPI will provide info on condition of (you may also wish a Carfax)
>a/c operation
>front suspension bushings
>rear suspension bushings
>chassis/motor/brakes/etc.

if you use search you'll have a wealth of info to get up to speed on these cars, or if you start reading the Hot Rod Forum past posts ...they'll be all there...you have hours of fun ahead

good luck and let us know what turns out
-fad