I paid $750 for the heads with valves new in the box. He wouldn't budge on the price. I figured I got a good deal since I have never even seen a set for sale.
I'm pretty sure last Fall Fling he was asking well over $1000. I thought more near $2K. IIRC, I overheard him asking someone what they thought they were worth. Sounds like a sweet deal if they check out ok.
The 4 bolt block is exactly as you described. All of the splayed main caps go into the water jacket.