Save up then. I've had my 86kwer for a while now. To get it to go really well I know would require $$. I just think if you're going to put money into it you might as well make it worthwhile. You might find in a year or 2 you sell the Ae82 (assuming that's what you have) and move onto something quicker. I'm happy with mine, awesome on petrol, minimal repairs and has decent power when you get a few revs on board.
Seriously, on P plates you don't want anything much quicker than a bigport...just looking back and thinking of some stupid things done and more kw = more trouble (i Know i sound like a dad), but so many p platers in commodores etc end up wrapped around poles.
Good luck with it..just a few cents of mine that may not count for much