I have a 66 L-60 and Im going to give you a heads up to maybe save you some money. When I got my truck it had the widow makers so I looked around and finally found some wheels and it cost me about $2000 for a set of 7. Then when I started to rebuild the rear axle I found that the differential gears were in pieces and damaged a lot of the internals so I had to buy a rebuilt carrier assembly that was $1250, when I tried to find a good used unit they also had the same damage so I had to go with the new one. Next the brakes were a headache because the wheel cylinders are not being made anymore but I did find some that worked I just had to drill an extra hole.
So what I'm getting at is make sure your axles are in good working order before you start investing in wheels and tires. If I would of known these problems were there I would have upgraded to more modern axles and be able to use a more readily available wheel and tire package and maybe even disk brakes.