35k today will buy you an SS small block 4 speed car with zero rust.
Add a few more k and you have a 396.
5k more will be a very nice numbers matching car that will continue to appreciate.
If you just want a good clean 4 speed driver with PS and PB, you shoukd be able to sneak in for under 30k.
What to look for -
Rust of course. Worse place for these cars is in the trunk and rear shock mounts.
Next worse place is in the driver side floor pan right next to the rocker panel.
Look for excessive body shims in the front fenders. Particularly if there are a lot more in one side than the other. This typically means that there has been some damage to to cowl area.
Doors are fairly heavy and they eat hinges and pins.
Rust under the leading edge of the hood and the same thing for the trailing edge of the rear deck lid.
The cowl tag behind the master cylinder on the firewall will tell you where the car was built and what it was built to be. There are a number of places on the internet to decode the cowl tags. Some people say that the x11 cars were SS cars. Frankly I have never seen one. I have seen a lot of X11 cars that were basic plane-jane Camaros. Mine is an X55 car. 350 SS 4 speed with D80 (rear spoiler), etc. it is badged as a Z28. Be aware that there are more 69 Camaro Z28's on the street today than Chevrolet ever produced...
They never built an automatic equipped 69 Z28 and don't let anyone tell you that they have the only one.. Mny other things to look for too, but this is a starter for you..
Prices - are starting to drop now in anticipation of fall. Good time to start looking. September is the best time to buy..