The belltech flip kit has pinion angle factored into the brackets so that for most, shims are not needed on a RCSB. Not sure about the DJM kit.
As for the notch kit Sled posted above, if you plan on towing or hauling anything and do not plan to run helper bags, I’d get that weld-in bigger notch kit vs the belltech bolt-in. It forces you to cut up into the outside edges of the same bed frame supports you notch for the pumpkin, but it gives you more travel too. This is especially helpful if you’re thinking about a 7” drop as my belltech 6” flip and notch has my rear axle sitting about 2” away from the bump stops and about 400lbs in the bed eats that gap up. No room at all for me to go 7”.
Last, with regards to what sewlow said about the springs, I have the belltech 2-3” springs in the front of my 98 (with belltech spindles) and I just cut the springs in the front of my 94. I do not notice a difference in ride quality between the 2 but I did notice 2 things: #1 the 2-3” springs from belltech are softer than I’d like causing my tires to rub the underside of the inner fender when hitting grade changes at speed that cause the suspension to travel under load. I have 4” total in the front so unless you plan on running a much shorter tire than the pic you posted, you’ll have the same issue with a 4” and especially a 5” front drop. #2 I cut about 3/4 of one coil and I ended up getting 2.5” of drop on my 94. If you’re thinking about doing just 2”, I’d figure 1 coil is 3” and start from there. You can always cut more but you can’t add it back. Use a spring compression to help get the cut spring back in the seat. Believe me, it’s a ***** without it. Also- for the price, you can’t beat a cut coil.
Last, regarding the spindles, I have the belltech- great quality and everything but eventually, I plan to get the DJM. This is because to me, the 2WD truck already has a narrower rear end than the 4x4 trucks do and it already looks like the front tires sit out wider than the rear with the same offset wheels. I’d rather my front tires set into the frame another 1/2” and help counter that goofy bulldogish look. Also, I’d rather have a little more forgiveness when running wider, taller wheels and tires that weren’t specifically designed for this truck.
Hope some of that helps!