These are original Summit cast iron heads that were rebuilt in 2010 by D&G machine shop with all new everything and I have all the receipts including flow numbers. Specs are standard 2.02/1.60 valves 200cc intake and 72cc combustion chamber. With these springs and work done they are good to about .520 lift. There was port work done, guide plates, 7/16 screw in studs, 3-angle valve job, resurface heads, valve seals, shimmed to correct installed heights. The car ran low 13's with these heads.
I would sell the camelback and use the money to buy Pistons if need be to get the compression where you want it with the summit heads. They would be a much better fit for your 383. Since you are going to most likely go through the whole engine to freshen it.
Looks like they don't offer that exact configuration any longer. This part SUM-152123 is the closest to what I have which is probably the one you found.