Chevy never had a 400 small block in any year Camaro (that I remember) from the factory. The car may be a factory SS car, but the engine isn't original .
The SS models in 69 came with either a 350/300hp or a 396/325hp- 396/350hp- 396/375hp. All had dual exhaust,front disc brakes ect. If the price is right it still is worth checking out. Cary
69 Z/28 R/S : Daytona Yellow, Blk Vinyl Top, X33, DZ302, M21, 4.10 Posi, Blk Deluxe interior, 8k tach, console and guages, wood wheel and dash, ZL2 ducted hood, endura bumper.