do you want to swap t-cases or use your existing one? If you want to stay with what you have, you need a Ford front axle. How big are you going?? Is it gonna be wheeled, or mostly street drivin?? What about wheels? If you want to stay 6 lug, need to find a 78/79 3/4 front and convert to 6 lug, but if going 8 lug then already set. Rear is a bolt it.
I would make the spring brackets, after having a set of ORU's and what they change is insame IMO. But if you can't make them, Sky Man. has the best price.
Look in my sig, I did an SAS on an 89 GMC 1 ton that I should have NEVER gotten rid of....