$650 a set, for the pair, not per head. Core needed to retain that price. If you don’t have a code to send back on that 1:1 basis, add $260 to the total price.
$322 per head, $644 for a set of heads, $904 with no core return.
If you have no cores to return & for the sake of argument we will consider the heads done right. The question becomes, are these heads, for you the end user, worth $904?