Those heads were already rebuilt. Those heads are K114 November 11th 64.

Do not reuse those valves. If you are going to rebuild them, heads are the most important factor in performance.

A good set of new valves, new springs..retainers and locks.

The difference in price between reusing old/new is maybe $250-325. You will pay $5-8 a valve for cleaning and resurfacing. A new quality valve is $10-15.

New springs are a great idea if you plan on keeping the car. You got the heads off...I would spend good, quality money there.

I would also install new guides..I would never knurl them. cheap fix when tolerances are loose.