I was doing some research for disc brake setups on my '63 GMC useing the site search engine and came across some interesting info. If I followed everything correctly, it looks like you can take the suspension crossmember from a 73-87 pu and almost bolt it into the 63-66 Chev/GMC pu. This then allows you to use all the suspension components from the donor.
Have any of you used this setup yourself?