Time is money but if you have time and access to tools, why not?
So, if you want to save the heads, lots of options. If you could find a shop willing to spend a couple hours per head, you could make a 3-4 cc cut on one chamber on a mill and then just copy from chamber to chamber. You could even do a set of Singh grooves
(nobody thinks the grooves really do anything, but you could play and eat up a cc or so more)I'd likely not do this, but you could even sink the valves a little bit depending on how proud they are right now.
In the end, if you want to play, the heads aren't valuable, but could certainly be usable, depends what you want to spend in time or money
One thing to remember though. Take the cost of a set of custom pistons minus a set of cheaper pistons. If you spend more than that, you could just buy a set of modern pistons for the exact compression ratio and quench you want and never have to take the heads apart