I bought a 67 wagon with a 428 in it for $500. Sold the body to the scrap yard for $209. I bought 5 352's ( 390 truck motors and car ) for $125 each. I will have to pull the heads to see what I got. I've bought 2 69 LTD's for about $250 each. Pulled the motor and sold the body to the scap yard for +- $200. I keep the 9" rear ends. I think $500 to $700 is high, but each area is has different pricing. Run a ad in the local paper and see what is out there.
Dwight