Have Some Suspension Ideas - Need Input

[68C20 CST]

I have a 1968 C20 with a big block that has been converted to front disc brakes from a 1971 C20. I would like to do a mild drop/leveling and still keep it 3/4 ton capable. My plans are to do a 2.5/4 drop with 2.5" c20 drop spindles from performanceonline.com (along with the original C20 springs), and 1/2 ton rated rear 4" drop springs (trying to get a better ride with the drop). In addition to the lower rated rear 1/2 ton springs, installing an air bag overload system in the rear for when I need to use it for heavy loads or towing. I know a lot of people will say "you will wish you had went lower" but I dont think I will be able to and still use the truck for what I want to. Another reason for only 2.5/4 is I still need to have E rated 3/4 ton tires on the truck and dont want to run into issues with rubbing because I cant find any heavy duty tires under 30" tall.

Questions-
1. Has anyone done anything similar to this?
2. Will I still have enough axle to frame clearance in the back with the 4" drop along with inflated overload bags to still use this truck to tow what it would orignially?
3. I need some help on what air bag system to use in the back.
4. Any pictures of a 2.5/4 drop so I can get an idea of how it will look?

Sorry for the long post, and any input, suggestions, or help would be greatly appreciated. Thanks



This is how the truck sits now.

[N2TRUX]

I have never done this with a C20 but it sounds like a solid plan. I ran similiar set up on the rear of a SBCC truck and it worked great. Have you verified the length and width of the rear springs will fit? Double check there and see if it gets what you need.