Any led kits for 64-66 barracudas?

Safe/effective retrofit LED lamps are possible but not simple to construct. See threads here and here for two examples of homemade LED light projects with the right amount of thought, effort, understanding, and technique behind them to be probably safe.

For those who lack the tools, expertise, and equipment to make their own safe and effective LED lights, and who are wise enough to avoid the fast-talking profiteers—the vendors who offer "LED retrofits" for classic cars—but who want LED lights, you can sometimes get clever with ready-made truck/bus LED lamps placed inside the lenses of your car's original lights. You have to be careful to get the placement right; they need to be upright, facing straight, without any slant, tilt, or inward or outward rotation (the exception is the units made specifically for postal trucks with a 7° forward tilt to the rear surface where the taillamps are mounted). If the units you pick have a "TOP" marking, it must be at the (duh) top. My favorites are these, in clear-lens variety when available; their performance is excellent and they aren't expensive:
http://www.levineautoparts.com/vali6ovledla.html
http://www.levineautoparts.com/sttutareled4.html
http://www.levineautoparts.com/truckliestt.html

"LED bulbs" designed to be installed in place of regular bulbs are dangerous and illegal. They don't put out enough light and they don't spread the light through the necessary range of angles.