Part of it depends on when you sold them. I paid between what you sold those heads for and the OP's asking price(for bare heads) 6 years ago for fully dressed heads with original tulip valves ready to install. I bolted them on and went.
Wovenweb, I saw your car and you are running #17 350 heads on your 68.
1967 RA convertible 1968 H.O. coupe - sold 1976 Trans Am - sold 1985 Trans Am - sold