I HAVE TO SAY THERE ARE A TON Of WHEELS FOR 8 LUG TRUCKS !!!! Problem is most places don't keep them on the shelves creating the illusion there are none . Almost all 6 lug style wheels are avalible in 8. You just need to go to a good wheel shop.
http://adaptivestrategies.com/Wheels.html start there to find a style they have most then call a place you like to deal with and tell em what you want . I am all about a resto type job with small detail upgrades to set it apart. wheels, paint tricks, interior upgrades are the top dogs to set yourself apart. Good luck with the prodject.