yeah I've seen that neat little wheel gage somewhere too ? where ? I dunno now, old age !
try this www.earlywheel.com/choosing.html
you can fit pretty big wheels and tires under a 66 up to 10" wide on the rear
but a safer bet for a 2" lowered car would be an
8 & 1/2 x 15" with 50/50 offset or 4 & 1/2" backspace with 275 X 60s on the rear
and a 7 x 15" with 3 & 1/2 - 4" backspace with 235 X 60s up front.
But the choices of wheels and tires now are endless so hopefully you'll get lots of replies
with combinations that fit
and somewhere on the "american racing" or "cragar" web site is a calculator.
so have fun.
I don't think you will find one used as those who buy them at about $300 new usually use them; but e-Bay says you can find anything there. I would call around for a tire store that has one, and get some info from them about what wheel tire fits best; then you can always go home and ask the Mrs. for permission (armed with the info obtained).
Re-reading my post it wasn't well worded. I wasn't so much looking for a second hand tool as feedback from someone who has actually "used" one. I was able to find the Wheelrite tire and wheel simulator today and bought one. I will let you know how well it works after the tire and wheel combination it simulated arrives.