Cant't get wheels to tuck!

I have a 86' b2000 bagged all 4 corners sittin on shitty 15's that won't tuck. I going to get some new ones. Anyone tell me if I can run front wheel drive rims just by using spacers?? I'm thinkin of doing a going 6 to 5 bolt front wheel drive rim, more selection... How big a rim can I go without doing major body mods??

350mazda..

if u want sum nice rice and not have to put spacers on go out and get yourself a set of caddilac escalade 17 inch rims and wrap em in type 0 tires they fit and front wheels turn stop to stop....iv got a set on my truck...they look good 2... but on the back brake drums there tabs u will have to grind off to make em fit...it dosnt hurt the drums any just makes it fit...they look slick too...check out my profil to take a look at my truck tuckin 17 inch caddis