Whats a fair price?

I recently had my 318 retire. An intake valve and piston decided to fight, both lost. LOL. I have a guy interested in the J heads. One head is perfectly fine and the other had one valve break and mangled up the chamber a little. It is repairable luckily. All springs, other valves, keepers, and retainers are in good shape. I am just wondering what a fair price is to start at for the pair?

He also wants my Torker II 340 intake. It is the old version, which I was told is better than the newer version. Whats a rough value on this?