Keep in mind that the AA kit is for a SB Chevy rather than a SB Ford such as the Windsor. I'm planning a 5.0 Ford crate motor swap in my CJ now and have been collecting the parts so I have a few insights. Also search under 5.0 swap for some lengthy threads on the job. I was initially going with the Jeep T-18 for this project and have the AA kit for it which allows a Dana 20 T/C to be used, but I wanted more crawl than the 2.0 Dana 20 would allow, so I sold the T-18 and am now in the market for an NP435. I plan on using the Novak kit ($600 roughly), rebuilding the NP435 in the process of swapping in the new mainshaft and then using a Dana 300 T/C (same as you have right now in your CJ) with better compounding 2.64 vs. 2.0. This allows a direct bolt up of a twin stick. In your case, you already have the Dana 300 T/C so that's less cost and the Novak NP435 and AA T-18 kits are roughly the same price so take your pick. You will need a 70s Ford truck bell housing with the butterfly bolt pattern.
Keep in mind, the trans/TC swap depends on what you plan on doing with the rig. Me, I want crawl and with 5.38 gears, a 6.34:1 first gear and a 2.64:1 T/C, I should be able to get a respectable 90:1 in my CJ-7 versus the 57.8 I get in my Scrambler with the T-18 and the Dana 20 with 4.56s. That's a huge difference. If you want street, you might consider something else as first gear will probably be unusable anyway.
In any event, stay away from the AA Ford SB motor mounts. They suck compared to the M.O.R.E. ones.
As far as the AMC Corporate 20 goes, IMHO, it's plenty tough with one piece axles with an 8 7/8" ring gear, the weak spot is the axles and the rosette welds in the pumpkin break and the tubes spin. I had a AMC 20 with Mosers and an ARB in it with 33s and never had any problems. I can't vouch for 35s.
I think the swap will be fun. Take your time, plan it out (like others said) and don't get frustrated. Take the nose off the Jeep, making access easier and be prepared to ask a lot of questions.
PS: if you need an AA adapter kit for Ford bellhousing to Jeep T-18 PM me, I've got it.