I made this exact upgrade to my 69 Camaro. Lights are awesome!
First I made the relay upgrade to both my high beam and low beam.
Second I upgraded my alternator system to an internal voltage regulator 94 amp system.
I followed the MAD Enterprises
instructions for both electrical upgrades.
I then installed these Xenon headlight bulbs and housings.
I don't think the alternator upgrade was mandatory for this headlight upgrade but it sure helped my big amp stereo and the headlight dim at low RPM.
I have to tell you that I love these headlights!!!!!!!!!!!!!!!!
I was just out last night and they are awesome and a major improvement for the money. I think I spent $90 total for the bulbs and housings from http://www.heavenforcars.com/
You can go one steep up from these to High Definition lights like on BMW's and high dollar euro cars but the HD system start at $1,000.
69 RS Convertible Camaro, 350/350. Orignal red with black top and interior.
[This message has been edited by jrager (edited 05-22-2002).]