Not much to cover that hasn't already been said. I don't know what Crossle is talking about push-rod tubes, it's an OHC motor Are you thinking of a beetle?
The 3.2 is a good engine. The last year is the best to get as the g50 is a much better trans than the 915 I think most of the 3.2s got. Fairly trouble free, much more reliable than a 964, but not quite as simple as an earlier 911 SC. They leak oil which is fairly common and some of them will have snapped head studs. You can do about anything with a 911 because the engine bay is about the same size through most of the model lineup. It's not overly difficult to swap in a later 3.6 or any number of other popular engines.
Watch out for rust around the windshield, make sure it hasn't had any monkey-mechanics going on and that sort of thing. The earlier 911s had rust issues around the torsion bar tubes as well, so check the floorpan pretty well. EPR does good work- Ed is always friendly and does all kinds of nice custom work. Last time I was there he had an older 2.7 (?) that had a 993 body kit on it and he was painting another 911 in Audi pearl. Good work and not sheisty like Auto Assets can be sometimes.
Forgot to add... The motors will go 180k miles just fine, but most get rebuilt before then. If it smokes, the valve guides probably need attention as that is fairly common. If youlook at a targa, see if the seals have been replaced because most of the originals will be leaky by now.