I received my closed chamber heads and while comparing them to my existing heads it became clear that they are closed chamber as well. The car is a 74 and I had assumed they were open chamber. My current heads are setup nicely with SS valve, milled pedestals with 7/16 studs and guide plates, and smoothed intake ports. It was going to be project to duplicate all of this onto the heads I just bought. Now I just need to sell the heads I just bought.
Also, my motor is disassembled and getting new rings and bearing.