Awesome, thanks a lot for the info Blokes. :) I'll be looking into changing the dash soon, definitely going to have to tackle the interior with a stick.
So after I finished work tonight I fiddled around with the dash and pulled off the front cover for the original radio and instrument cluster, will have to pick up another one that isn't cracked, a steering column cover and the rest of the dash which sits on top which is really cracked and corroded from 30 years of tanning. (Much like some of the old dinosaurs at work)
I found that on the back of the original head unit the wires weren't soldered, I assume I would be able to attach them onto a new head unit easily and have full power? Correct me if I'm wrong because I'm totally inexperienced at all things involving wiring.
Also changed the air cleaner with a new one that came with the car.
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