8 lug back spacing questions??

[69Chevy3/4ton]

I have a 69 3/4 ton and it currently has 16 two peice snap ring wheels. I want plain old tubeless steel wheels. My question is what do it need to look for as far as with and back spacing? I would like to go with a little wider than stock and with the backspacing sticking the wheel just a bit farther out than stock. Can any one help me please, I have looked around the net and also called summit and asked about cragar steel wheels and they dont know what fits. Every place i call locally ( hickory nc) wants close to 200 for a set of used plain 16 inch wheels and summit wants 230 shipped for new wider wheels but im not sure they will fit. Let me know if any one has any info.

Thanks, Darrell