LOL, funny stuff.
The A4ld is an updated overdrive version of the C3, yes. But the C4 is a completely different animal. The A4ld and C3 are relatively weak. You can build them up to hold up to maybe 300hp, but these transmission just don't have the load capacity to hold up very long. Eventually, it will fail again.
The C4 will hold 300rwhp with a shift kit, and actually last indefinitely at that power level. There are builders that sell C4s built for up to 1000hp!
I have a C4 in my 88 stang (used to run the A4ld and actually killed 3 or 4 of them along the way). The swap is relatively easy if you have the right parts. There is a factory offered bellhousing for a 2.3/C4 combo (from some pintos), but they are quite rare and go for a lot more than they should be worth. There are also 2.0 pinto bellhousings that can work with stepped dowl pins.
You will also need a converter. Depending on your power goal, anything between a stock pinto converter to a custom converter will do. Flex plates are easy to buy new or find used. Making the kickdown linkage work can be tricky. I didn't bother to make mine work, and this transmission can work without it (just no kickdown). I am still using my A4ld shifter, but it doesn't fit quite right. An aftermarket shifter would be better. Use a T5 or AOD driveshaft for the correct length, and a T5 crossmember.
The C4 has held up great for me. You can see my times in the signature. I have never rebuilt a transmission until I tried freshening up my C4. It works well and has held up to a LOT of abuse. I'm still using a stock pinto converter, but I know it's days are numbered. I see 3500+rpm minimum on a nitrous launch.
The C4 has no electronics, so no worries there. You could make the reverse lights work with an aftermarket shifter.