Right Direction

I am getting ready to start the measuring process for new wheels and tires for my 74 Duster.

The front suspension is off of a 1969 Dart and the 8 3/4 rear is out of a 1966 B-Body. Thus, both the front and rear suspension is wider than the original equipment for a 74 Duster.

My biggest obstacle will be getting the correct back spacing.

Can someone give me a starting point for Wheel and Tire size that may fit? I really want to go with polished solid center lines.
Here is a link to my car in the resto section: http://www.forabodiesonly.com/mopar/showthread.php?p=875956#post875956

I am also running a 3:23 Suregrip and 4-Speed.

I'm considering purchasing one of the Percy Wheelrite. I would hate to spend $1500 to 2K on wheel and tires that may not fit right. It would be nice to take it to the wheel shop and have them do this but most shops I have spoken to don't seem eager to help.

Thanks!