Why don't you go with disk brakes? you can do this cheep if you do what I did. I bought a complete 77 1/2 ton chevy for 400.00. The front spindles will work with the torshon bar suspension if you use a 7/16" to 1" reamer on the lower ball joint hole. You can even use the upper a arms from the 77 cause they are the same dimentions as the 60. The power steering and linkage will work perfectly also if you space the box about a 1/2 to 3/4" away from the frame. The power brake booster and proportioning valve along with all the brake lines will also work with no problem. You should be able to get everything you need off of the late model truck to update your 60 and sell all the left overs to get your money back and then some, I did. Check out my 61 step side, everything came out very clean without buying any expensive kits and was easy to do. These same parts will also work on the 63-66 and you don't have to ream out the lower hole on the spindle. All you have to do is change the lower ball joint to the late model one.
Engine swap thnk'n..... was thrr to much of a differance besides engine mounts from a 72 350 to a later LS1 engine? or Z06?? i have the newer 'engine to frame mounts' thrr tubular,,,very awesome!,,n i have sum upgraded engine mounts,,i have the 350 installed,,i wuz jus wondering bout if i did a swap later tho,,wut wud i need?,,,i luv the newer Z06 engine sound,,but i also do luv the 350 with a mild cam sound,,LOL,,BUT!!!!! if i keep the 350 n my 66 gmc i cud 383 it out!! heehe,,,any info on swaps is much appriciated,,and yea i thnk too much sumtimes lol...
I'm not sure how to post pix of my 61 on here,but if you go to the photo gallery on this site they are listed under 60-66 bigtimjamestowns 61