well ls1 are probably the best engine , provided you like the updated camaro front end exterior wise.
I know of a couple of ls1 for sale, one red one teal blue. both auto.
generally auto are cheaper than manual due to rareity.
give the car a quick rev when stationaty, (in neutral) but not to limit, you can tell it should feel smooth. Check gearbox (on auto) changes nice and smooth but definitly engages and doesnt hesitate or slip for ages.
Check for history, you'd be supprised there are still people who drive about and dont open the hood. Check oil to see if it's clean and full. Make sure electrics works, windows are notoriously bad, but can be sorted with a motor for £40 + fitting.
LS1 are easier to tweak later, if youre after a bit more umph.
Have a drive, theydo 'wollow' a bit in standard form but check for knocks and bands and very bad, noticable diff whine at in all conditions , accel, coast, cruise and decel.
PM me if you have any more questions
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'99 Z28 A4, 253 LS2 heads, 228R TSP cam, Patriol Dual Springs, Double roller timing chain, LS6 ported oil pump, OBX LTs, 3" True Duals, LS6 intake, 42lb/hr injectors, SLP lid + bellow, EFIlive COS 3 Speed Denisty Tune (self tuned), 3200 Circle D stall, CAI mod, KYB AGXs, Eibach Pro Front Springs, UMI panhard, LCA + Brackets, Strut Brace, Custom Subframe connectors, WS6 axle with 3.42s, 18" American Racing Rebels, US mirrors, 93 tail lights, 3.5 inch custom cowl hood. Mickey T's Street DRs on Vette-ZR1 wheels for the strip !
Best ET: 12.0 @ 116 mph (on a 0-60ft of 1.8 s)