Front Suspension & 15" Wheel Backspacing ?

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'64 Cuda

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I've looked through the postings of wheel & tire combos & couldn't find the answer so I'm hoping somebody here can help me out.

How much backspacing can you get away with using a 15" aluminum wheel on the front end with the SBP discs before you hit the upper control arm or other suspension parts? I know a 14" steel wheel is really close to the end of the UCA with about 4 1/4" backspacing. It looks like the choices I'll have with a 15" wheel are going to be about 3 5/16" or 4 7/8". Is the 4 7/8" going to clear?

Here's another question. Do you think Center Line AUTO DRAG wheels look better in natural finish or polished?
 
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