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Adding photos that show stock option mentioned by "CaptainFab" above and keeping 6 lug wheels.
Changed out the spindles for the 1 1/4" thick rotor, as mentioned above. These came from a 90' suburban 1/2 ton.
The conversion rotors are an upgraded version with slots.

Which wheels clear calipers, 16" diameter wheels generally clear the caliper ( non original disk 15x5" wheels general do not clear) . An inexpensive and new 16" x6" 6lug wheels is a trailer wheel, it has no vents, photo below. In wneel selection you also need to consider the outer tie rod clearance to wheel, it is effected by wheel back spacing. An advanced search here should show post that reference which 16" factory wheels fit. The stance of your truck and tire size you want will effect wheel choice ( also how original you want the the wheels to look, their are small changes to wheels for certain year trucks) A advanced search of tire/wheel size in the 60-66 forums will provide lots of background
information about fitment.

Total replacement with newer crossmember offers a few design improvements, that are nice.
If you want a little more original look, you can just change the spindle, as shown in photos below. However, swapping the whole newer crossmember is very easy.


Welcome to the forum.