340 T/A (U code) head value? (Pics)

New to forum, may not be the right place....
What would a set of well seasoned 340 U code heads minus rockers (OF COURSE!) be worth?
Still have lead from leaded gas in ports!

Would you offer more for the 20+ yr of dust? Lol

Thanks in advance!
View attachment 1715625290
View attachment 1715625291
50 yr old heads, 800 bucks. Maybe a numbers guy would give 1000 or more. The valves are all junk probably in the heads need another six hundred bucks to them to get him in shape plus parts