62 and 16 CORES go for $300+ a set unless they are rusted hunks of junk. You'll have a hard time finding any popular # big valve heads that have had good work done to them for less than $600 unless someone is dumping them.

I put $700 into a set of original to the car #16 heads. If I had to buy cores I'd have been out $1K. And that is a nothing crazy but all good parts build, with professional machine work, Ferrea stainless valves, hardened seats, new guides, correct springs and all geometries properly calculated.

Heads aren't cheap, but without a good set your car has asthma.