Looking for my cars original 340

I have a block dated 7-9-69. I was told it was from a Barracuda/Cuda but I don't recall the reading on the stamping. It is .030 over and ready to reassemble, the crank is ready, etc.
I know it is a long shot but what is something like this worth in realistic, fair money to both sides? I'm not one to squeeze every last dollar from anything.
With that date code it would be for a 1970 car. I just sold a 340 block for $400 and it had some issues. For yours I would want $1200 minimum...