Rear Tire to Leaf Spring: How Much Clearance?

[CliffsBlueCamaro]

How much clearance should I shoot for between my rear tire and the leaf spring? I'm assuming that it is possible for the leaf spring bushings and shackles to have some play in them, but any suggestions on how close I could get to the leaf? (Assume that the rear inner fenderwell has been pushed all the way to the frame, and the tire's first point of contact will be the leaf spring.)

And, I would like to ask a favor from someone with a stock length rear in their 1st Gen Camaro; Can you give me the measurement from the wheel mounting surface of your drum or disc to the leaf spring? I will be away from my car for a few more months, and I'm trying to see if my measurement theories are correct.

Thanks for any help or advice you can offer!