79gmc, I used a Lincoln MK7 lsc rear with disk brakes in my 84 Monty. As for advice get spherical upper housing joints and the base line boxes and upper control arms. I was able to use the stock drive shaft and stock lower control arms. I recommend that you get good spherical lowers or move the brackets since there about a 1/2 inch off but can be pushed into the mounts since the rubber bushings flex a bit. I got a gm 3R to 1350 ujoint and a spicer 8.8 1350 flange. As for the brakes I made new lines, I have heard the stock 7.5 fittings will work on the 8.8, don’t know didn’t bother looking. Shocks were simple I was able to use stock shocks in the stock mounting points on the chassis and stock points on the rear. I recommend new shock mounting points since the stock shock limits downward travel to ~3” if you want more. Hope this helps you out some. I know it helped me at the track, my car went from 2.2 60 ft to 1.8 with the baseline upper box kit alone.