Recommendations for 340 head gaskets and timing chains?

I got a chance to look at the rollmaster timing sets there’s 3 of them the red cs5000 an 2 different gold ones cs5010 , and a cs5020 . I don’t think cs5020 is for me as it some odd looking adjustment on the cam gear . But the other 2 options I really didn’t think there was any difference but I’m sure there is. Can some one tell me the difference.