1967 Mustang headlights

the lamp pictured is not Xenon

It will probably overtax the internal circuit breaker in the headlight switch. If it doesn't I would still think to get full illumination from the bulbs you would want to look into getting this:

RJM Injection Tech Headlight Harness

If you want good headlights just get that harness that was just mentioned and a pair of 6024 Sylvania Xtravisions. I think the part number is 6024XV. These bulbs are increased wattage (similar to what cars have now) over regular 6024 halogen sealed beam repalcements. The factory headlight switch was never intended to carry the load of the halogen bulbs. I have this setup on mine and am very happy with it. All of those blue tined bulbs are crap. This even means Silverstar which has a coating on it. All that does is give of a whiter light but reduces the actual amount of light transmitted through the bulb.