I've got a used 218/212 Comp Roller Cam for sale. Got about 5k miles on it and is in good condition. Only pulled it out because I wanted to go with a smaller cam. Looking for $180 plus shipping.
I've got picks upon request.
You would need a new thrust button, roller cams dont use the spring. Just a button with some shims. As for the stock chain....I guess you could use it if you wanted, but Id go with a double roller.