Welcome to CHR Scott.
I had the same problem with a 235 six in a 53 Chevy. They get oil residue on the bottom so they don't come out easy. I had to grab the top edge with vise grips and yank on them. then tap them back and do it again til they finally came out. I ruined a couple of them this way and they aren't cheap. I bought a nos set on ebay. The parts store wanted $36 each.