I'll try...
The 191 heads:
I personally wouldn't buy a set of bare heads off ebay or anywhere else unless it was from someone I knew well. I am very suspect of bare heads. If you took time to tear them down, why didn't you build them back to ready. If you have a fresh complete set that are ready to bolt on with premium valves, springs, etc.... those were bringing $1500 - $2000 depending on how good of shape they are in. Most people who sell fresh heads can and will provide receipts from the machine shop work attesting to the parts used and show proof that the heads were magnafluxed and pressure tested. Nobody I know buys bare heads from an unknown source, least not me.
I would get them checked out at a good speed shop and assembled with premium parts before I would try to sell them. Most shops will not rebuild a bad set of cores. If they are rebuildable, you will sell them more easily, and make more money if you do.
The Intake & crossover:
If there is no damage or signs of repairs and all the bolt threads are in good shape or have been repaired with heli-coils, I'm guessing about $800-$1,000 for the matching pair.
$2300-$3000 on average if everything is pristine with no hidden surprises. Nasty or Rusty wont sell for much.
Hope this is what you wanted to hear.
Eddie
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