Perhaps all the added width on the new wheels went to the outside, none to the inside? How much clearance is there between the inner rim and the upper front suspension arm?

I'm fitting 205 width tires in my car, and it sits pretty low (front and rear). So there is room inside there, the tire just needs to be in the correct position, the correct offset.

Sounds like a readjustment of the panhard rod length might be in order. A panhard rod isn't that great of a method of locating an axle side to side - the axle will tend to move from one side to the other, then back, as the suspension is loaded and unloaded (side to side leans make a bit less difference). Fine tuning the position with an adjustable panhard rod will get it to look right when it's in a certain position, but it will still move around on the road as the suspension compresses, or if you have a bunch of stuff in the trunk (avoided using the word 'junk' there!)
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'63 PV544 rat rod, '93 Classic #1141 245 (now w/16V turbo)