I agree with this 100%. sure you can do some nice mods to get it running, but keep in mind it might cost you more in the long run tha a more modern car with less problems.
Still, it's good to see you've got yourself a car, i remember my first car, a 1971 POS Holden Kingswood, nothing special there. save up for a few more years then get yourself a nice R34 or similar.
just a suggestion, you've seen what mick and mark have done with their R31's though