[robnolimit]

Well, the MII stuff is the lightest common stuff around. But, base MII IFS track width is 56.5". You will want 62" to 64" for a C10. FatMan Fab or Scotts may be able to help, as they use these spindles on Truck suspensions But, do you trust Pinto spindles to land on or run 150 mph.
A MII IFS with coil-overs and a P/S rack and 11" brakes will weigh in around 180 lbs (from my notes, you may get a different answer from some manufacturers if they know it). Our No Limit WideRide IFS is a bolt in, has a 63" track width, 12" brakes, coil-over and P/S configuration comes in at 194 lbs. WideRide IFS uses a custom forged spindle (very close to GM 'B' body Impala).

Swapping to a manual rack saves about 28 lbs total (rack, pump, pulley, hoses...) Swapping to a Wilwood 12.19 4 piston brake will cut 14 lbs from the WR-IFS. (about 8 from a MII) FYI, a stock C10 IFS complete assy with disc and P/S box weighs in around 330 lbs. Note: Wilwood brakes change the track width. On a WR-IFS, add 1" to the track width for Wilwood brakes, for a MII, add 3/4".