Front suspension swap will this work

[1967Bowtie]

I am look to upgrade my front suspension on the 67 c20. I know you can swap in the 73-87 a arms to get the better bushings onto the 67 cross member, my main question is there is a swap to change from 8 lug to six lug using 1988 - 95 spindles with lower c20 a arm and c10 upper on a 1967-72, can this be done using the 73-87 a arms on a 67 cross member to get the better ride and get the 6 lug wheel setup. If it will all work do you need a c10 upper and c20 lower a arm form the 73-87 trucks?