If sorting the buckled wheels doesn't cure the problem I would suspect the prop shaft! Has it been apart or new parts been fitted? I once replaced just the front yoke on a Mk2 Cortina (splines semed a bit worn) but didn't have it re-balanced. At 50 mph the vibrtion was horrendous! Ended up refitting the old yoke which luckily I had identified and all was well again.
Also do a quick check that there aren't any dribbles of paint or underseal on the propshaft as that will be enough to throw it out of balance (as does repainting it!). Peter.
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