Trying to adjust valve lash and I ran into a problem. This is a 1962 235.
I found that the #4 exhaust valve adjustment screw is significantly deformed. I have attached a picture with both the intake and exhaust valve adjustment screws shown. (the exhaust on is on the top if it's not obvious

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Of course, I need to replace the messed up screw, but these are hard to find. I have heard that Mopar or Ford screws will work. I need more info. Can someone tell me what I need to say to the parts guy who wants to know make, model, year engine size?
Surprisingly, the push rod looks OK!