Yes I believe they are cast iron. Ive had the car for 4 years but don't know much about restore. My wife's uncle had the car and gave it to us before his passing. I don't believe the engine has been touched for many years. They gave it a new paint job and put it back at restore from the evidence.
But I have hardly any oil pressure and it was knocking to beat the band for a minute. Ignition switch wouldn't cause that and no compression in #3 cylinder.