Winters 14011077 Heads

[ls6owner]

A friend of mine has acquired a set of 14011077 aluminum heads and has decided to sell them rather than use them on his race engine as they have never been ported of altered in any way and appear like new. He asked me about their value and I am hoping some knowledgeable folks here can help me out. A couple pics are below, albeit not the best pics but I have looked them over myself and they are in very good condition and unmolested. They are dated 1978. I found a For Sale ad from 2015 for a set like this for 2K. I'm guessing they are worth more now. I am not trying to buy them myself, only trying to help him out with a realistic asking price. Any help is appreciated.
Thx
Oliver