The A-body 8-3/4 is in the car. I'm looking at buying the FlexForm monoleafs too. I'll be using SSBC 10x1 discs (stole them from my other Mopar). GREAT idea of measuring from the rotor! Drop down with a straight-edge & measure in/out.
As I can tell, looks like a 8 x 17 rim & 255/50/17 tire will work. Guessing the wheel will need a 4.75 BS, both from other comments here, and my measurements with the stock steelie. Plus we'll have to use the offset spring kit.
Boy- I tell ya right now- the 255's won't last with this 500HP stroker going in! :burnout: