I'm looking to get involved with racing at my local club (Keilor). I currently have a Blitz with stock brushless motor/ESC, and a Losi 4wd SC kit that I'm about to start. I was wondering what motor and ESC I should be racing with? Can I run with the stock stuff in the Blitz?

It would be worth talking to your local guys at the club regarding where you can run. I'm sure they can fit you in somewhere with your standard power system. In the long term, you would be expected to comply with the class rules for motors etc, which they can also advise you on. I believe SC run 10.5 blinky, unless this has changed?