building moderate trail rig

[74 shortbed 406]

I just recently picked up a 78 k25 cheap. The body is rough and I have a pic posted of it on here. Bed is junk and will be building some sort of flatbed for it. It has a dead stock drivetrain which includes 350 with q-jet, 400, 203, d44 front and a 14 bolt ff(thought it was sf for some reason). I am not a dedicated rock crawled and the places I will be at 90% of the time are the woods. I still would like this truck to be functional as a much of a daily driver as can be. I am thinking of trimming the frame in the rear as short as I can, build bed accordingly, do a shackle flip in rear and maybe springs to get desired lift. I am debating on tire size, 35 is what's in my head. Motor is going to get some help in the way of built into 355 or 383. Haven't decided what tranny, keep the 400 or swap to 465. Haven't decided on the tcase. This will be the first I have owned with the 203. So any links or pics that are related would be awesome. This is also the first time I have had a 3/4 ton, I am looking to lock rear, maybe air lock front?