Another 302 Head Question

JJH said

I would look around, but most old vehicles are scrapped here. Not many survivors and the ones that do survive, are in use lol. I have yet to see a 273 around, and canada kept the Poly till 67 so that rules out 318s sadly lol. Are hardened exhaust seats something that can be installed? How costly?

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Yes, hardened seats can be installed. Some just replace the valves with stainless and call it good. I talked with my machinist when I built my 273 and we didn't replace the seats or stainless valves. I only put a couple thousand miles a year on the car at the most. It will be a decades before there is an issue.