Here's a pic of my 69 K20.
It has 35x12.50x16 Super Swamper SSR's on 16x8 steel rims. Nice and cheap rims!
I put a 4" lift consisting of 4" front springs and a 4" shackle flip from Offroad Design along with 4 Tuff Country SX8000's, a Rancho steering stabilizer, and adjustable drag link. I ended up having to lengthen and add a CV joint on the front driveshaft. The rear driveshaft required no modifications.
Later I added some additional leafs on the rear springs gaining an additional 3 1/2" of rear lift (7 1/2" total rear lift) At about the same time I added a heavy duty spring leaf to the front spring packs and a centerbolted tapered block up front. Front lift should be about 6". I am told the centerbolted block up front is safe, but it will be gone at some time in the future.
In the next few days I am adding a 2" body lift to give room for a 454 that is being installed within a month. The pucks were made by a friend from aluminum.
When the 454 goes in, I am also swapping in a 4 speed manual in place of the three speed.
The present engine is a monsterous 307 that puts out an incredible amount of power. Why I'm replacing it with a puny 454, I don't know
The rear axle is a Corp/Eaton with a factory Detroit Locker. The locker is great! The front axle is a closed knuckle Dana 44. It's gotta go someday.
My truck came factory equiped with a manual throttle and very little in other options.