I agree with YankeeDoodle, the VA Mustang units work very well, and don't seem to require any kind of relays. They are 50 bucks for 2-headlight systems and 100 bucks for your 69, since you have 4 lamps.
I also advise using a higher-output alternator and an electronic volt regulator, to keep the lights burning steady and bright.
Since I wanted the car to appear to be stock, I got a Beavco 105-amp alternator (comes in a stock Ford case - and is only about $60 to your door!) and a NAPA electronic alternator with an original Autolite cover on it.
The combo burns with a bright white light and does not flicker or dim at all on my car.