HID Headlights into 99' Classic

[DRAGN6]

Hey Guys,
I recently met someone that had genuine HID headlights in his car and am now curious about them.
I'm just wondering if there are any laws that state that I cannot run HID Headlights for all my beams.

I would like to run a combination [H4] High/Low Beamed HID as well as the separate [H1] High Beamed HID.

I am currently running 100w/80w 6000K Halogens, but they tend to build up quite a bit of heat and I would like to put in the best globes that I am able to, to help on the country drives.

A FULL HID setup is going to set me back around $300.00 and I think that it will be worth my time and expense, provided there are no laws against running HIDs in an AU Falcon.

I am also running Altezza Headlights.

The HID kits that I have been looking, state that they are for use in AU Falcons

Any input would be greatly appreciated,

CHHERS,

Dave