I'd suggest using the search function to find a comparable set-up to what you are contemplating.
I typed in "tires wheels", specified "titles" and selected the "60-66 forum", here is what I got.
http://67-72chevytrucks.com/vboard/s...archid=2343886
You got a stepside or fleetside? FYI: Stepside beds are narrower than fleetside beds so keep that in mind.
Oh, post up some photos of your truck too!
Happy surfing!