Here are a few 45 sides as released by Johnny Chester and Johnny Devlin. Three other noteworthy early/mid '60s rockin' greasers from Australia were Johnny Cooper, Colin Cook and Merv Benton. Naturally all these guys output was extremely variable...
Sorry but I wouldn't scream for Johnny Devlin, that's a really plastic C'Mon Everybody, and What'd I Say not much more feeling. I'll bet they dubbed in some of the screams from the Beatles set or something...
Things get much better after the Tom Jones wannabe leaves.