Rear Tires/rims w/SS springs

Hey All,
I'm looking for some guidance on what is the max Rear tire size or maybe, better yet, the preferred tire size for my setup. 73' Duster 360 (400HP- actually motor hasnt been torn down/built yet) 727 manual reverse pattern, 4.11's (8.75) with SS 002/003 springs in stock location. Car will be lightened a bit... Street Strip driven say 50/50 for now... What's a tire rim combo here to make it do a decent 1/4 mile, yet be street legal? I have a 4.5 on 5 pattern and looks like 5" backspacing. I'm thinking about a 15" x8" rear wheel. What diameter tires will put me thru the 1/4 mi. trap @ say 6500 rpm?

Thoughts, Comments and idea's are appreciated.


Eric