Re: Dz 302
There is a market for original 302 engines and parts.
You will need to post pics of the engine assembly code. If it is a 69 then it should read something like V0325DZ. You reference a DZ, which is the correct suffix for 1969 302.... but many folks refer to all three years as DZ motors. Technically, not correct, but that's what they do. Please understand, there are probably more restamped 302 blocks out there than genuine blocks.
There are several variables. A DZ block with no other original 69 302 parts (wrong crank, pistons, manifold, heads, etc.) isn't worth nearly as much as a complete running 302 with all the correct components.
Although very difficult to read, it would also be important to know the vin derivitive numbers stamped on the rough part of the block down by the oil filter. Lots of info available at camaros.org. Those numbers would be something like 19N571122. If the car it came out of is still out there, you might have an opportunity to re-unite the car with its original engine.