They also have new 214/181 valves , new locks , dual springs with a damper, new freeze plugs. HP is stamped right on the alternator boss's, and came off a 67 RT or GTX, I think he said RT. I put over 950 bucks in these heads including the purchase of them of 280 bucks, machine shop work and cost of parts. Someone will get a good deal I'm sure.
I also know it's hard to get all the cost back out with the cost of aluminum heads now a day. The springs will hold 600 lift flat tappet solid cams.
Hope this helps Jeff out.