I have a 71 Super that suffered from the shakes and I did all the normal things, alignment, tire balance, urethane bushings and new struts. Nope, did not work but then one day I visited with an old VW guy who told me if you want the shakes to stop, get yourself a 100 lb bag of anything and put it on top of the spare tire and the shakes will be gone. Did that and wow,no more shakes and I have taken the old car up to 85 mph before backing off.
The bags of sand is not a viable alternative for a non-shaking front end. I got another front end alignment, new tires and changed the front damper to a version that is a little more stiff than stock and wow, no more 100-pound bag. The car drives like a dream and had it up to 90 and backed off.
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