Having previously owned a 3rd-gen F Body, I naturally locked in on this thread. When I owned my 1989 Firebird (essentially the same as a Camaro except for the body), I did a *lot* of research on the beast when I owned her and acquired knoweledge from as many people as I could. If you do buy one, I have a few pointers for you that might be worth considering when you make your decision.
If you decide to get the L98 TPI 5.7L V-8, she puts out about 235 hp and 345 lb-ft of torque. The LB9 gives you, depending on year, 220-230 hp and roughly 300 lb-ft of torque.
Avoid the V-6s
at all costs! Unless you want a low-cost, cheap Camaro, stay away from the V-6 in the 3rd gens. To give you an example, the 2.8L V-6 was rated at about 135hp; the 3.1L was rated at 140 hp. The 2.7L 4-banger in my '97 Toyota Tacoma puts out 150 HP. 'Nuff said about the engines.
The only transmission you'll find bolted to the L98 that came from the factory is the TH700R-4 4-speed automatic. If you want a 5-speed manual you're looking at getting the 5.0L V-8.
If you get a 3rd gen, go 1988 or later. 1987 and earlier 3rd-gen Camaros were still suffering from the kooky quirks of the experimental smog-control setups and they didn't begin to approach refinement until 1988. The best years for the 3rd gen were 1991 and 1992, IMO. The 3rd Gen was built from 1982 to 1992 and the bodies on the '91/'92 look the best - the basic body style remained relatively unchanged except for some extra fiberglass here and there. They're the most refined from that generation of Camaros.
Things to look for:
*Coolant system leaks. The coolant system is prone to all kinds of corrosion and will be a source of many a headache if you get one that has a leaky coolant system.
*T-Top seals! If you get a Camaro with T-tops, plan on replacing the seals if they haven't been already. GM is notorious for having leaky T-tops on anything they made in the '80s.
*Posi rear axle: If you're looking to get the best traction off the line and don't really care about high-speed cornering, then a Posi is the way to go.
That's all that comes to mind right now. Have fun! The 3rd gen f-bodies are a blast to drive, look pretty good for their age, and can hold their own against some of your lower-tiered sports cars. They can be had for decent prices, usually, and the money you have left over can be used on things like a K&N FIPK, headers, a pair of high-flow cats, and a decent exhaust system.
Also, check out
this link for further information. You could also check out
http://www.thirdgen.org for an exhaustive resource on the beasties

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NSX-R
Do they have independent-suspension? Pushrod engine?
No Camaro or Firebird produced by GM had independent rear suspension. All of them had pushrod engines out of the factory from 1966-2002.