We installed a 91 burb front end on my 66 which makes it wider by 3/4" per side, the wheels are 17" x 8" cragars with no off set, the tires are 265/60/17" michelins. we also used 2.5" drop spindles with standard 6 cylinder front springs from the 66.........the attached picture shows how it sits and drives down the road......it barely cleared and I take it easy on rough turns......but so far it has not rubbed in the front. now the rear is a different matter.......should have moved my rear end back 1.5" to avoid clearance issues with the rear inner fender lips...............Kieth
http://kieth.smugmug.com/Trucks/66-G...zNtdr&lb=1&s=A
Nice looking GMC we GMC owners have to stick together........
Here is how my truck sat before the drop spindles:
http://kieth.smugmug.com/Trucks/66-G...0786&k=c5FVJVM
Oh yes we do have bags on the back so we can adjust the stance.....