Yes it does matter what size domes you go with if you go to small of cc you will need to run race fuel. Depending on your elevation you may be able to get away with 20cc domes that is what I have but I am at 4,000 to 5,000 feet. If you are at a lower elevation you may need to go bigger if you want to run pump gas.
I run Pro Design I like it but you would need to get longer studs and Noss makes a good head and I think with it you can use stock studs. There are other good ones out there too don't really remember hearing anyone complaining about a crappy coolhead so don't know what ones to stay away from.