[Ziegelsteinfaust]

I am starting to do a similar build for my C20, and I am going to start gathering parts here soon. Rally to me is stock height roughly with good suspension, road course is lowered with good suspension, and pre-runner lifted.

My concept is too

Move the lower A-arm forward 1 inch, and get a faster ratio steering box. This improves camber gain, and the feeling of you being connected to the road. I would do this if your suspension needs to be rebuilt or if it has you can just mod the lower A-arm for 3/4 of an inch forward movement. That will get you quite a bit of the way there.

I am going to try C10 springs for more suspension travel vs my HD C20 types. Use stiffer shocks to help control rebound. Coil over shocks would be better here just more expensive. I already have the big sway bar so I will just add PST bushings to it to firm it up.

I am going to run 265/70/16 on factory PYO rims. This keeps the un-sprung weight low enough, but still offers a wide arrangement of tires to choose from. Here I will probably run 4 good street tires most of the time, and a set of AT's when I actually do get to go offroad. Yours being a C10 you'll have to go with a tire no taller the 32" or with a 275 width. Beyond that it won't tuck under corners, or you'll need a bit of a lift to cover it.

My rear suspension won't be to good, but I will remove leafs for softer ride then add a track bar. You should have the truck arm setup, with light duty springs, and stiffer shocks. It would in my mind be an awesome set-up for rally fun. I will mod the stock stuff to see how I like the concept before I commit to spending money on parts I may not need or want.

In the future I plan to shorten my wheel base for tighter corners, but mostly for looks. Then I will add some sort of fuel cell to the truck to control fuel slosh or at least a blazer tank.