Can I run these rims?

[cfan10]

Ok, I have an '84 swb, I am wondering if I can run 15x7 4 inch backspace and 15x8 4 1/2 inch backspace. Two are multilug 4 1/2 & two are 5x5.
Also, one rim has a dent, will this cause air lost?
Is it possible that I can recycle my 295/50/15 on the 15x8?
What size tire can I run in front, without changing my stance as I want to keep it leveled out. They're boyds if that helps. Thanks for the advice, as I know nothing about rims/tire compatibility.
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