CAN ANY1 HELP ME?!?!

I'm new to the site and the rs turbo life, I've got a 1.1 bonus and fully converted it to an rs turbo.....(nearly). The guy I had the engine off told me that its been modified...with Kent Pullys, bigger cams, cossie actuator.
Are these the sort of mods to stay away from? If so then what do I take off to be running a sweet rst because the last thing I want is to BLOW IT UP!