$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?
Which heads are you talking about for $650? The summit heads are a stock valve job refresh with a core charge. I don't see a core charge on the Aero heads but I maybe blinded by the quality and price.
These with 2.02 are $599.
ARO-CY-SB340 1968-1987 340-360 A-Engine 1.88X1.60 SS Valves, (2.02 Int. Valve add $100.00) 67-70cc Open Chamber Design, .509” Lift Springs, 160cc In. Port Volume........ 499.00