Rebuilt Non-906/452 Heads from Aerohead start at $499.
That’s with bronze guides, SS valves, and HP springs.
906/452’s are $200 more.
But if you add hardened exhaust seats, 2.14/1.81 valves, and the bowls ported and gasket matched...... you’re at $1137($1337 for 906/452).
Pretty easy to get up into the Stealth price range.