Rear SS Springs

I have 002 and 003 ss springs on my 67 dart.
I jacked the rear up with longer shackles (here comes the nay sayers)
Moved springs inboard and stuffed 325 50 15 nitto tires.

Now the ride quality.
It rides better then my 2012 ram longhorn
Also rides better then my wife's 13 ford fiesta
Also better then my mothers 10 charger.
I have my dart in the BMW and Mercedes quality.

I also wonder if it's the stock seats that have spring in it rather than the dense foam of modern seats.

The wife is within days of going in to labour so she is very sensitive to bumps. She would rather ride in my dart with the ss springs. So dont believe everyone about the lumber wagon ride quality