RBV tcases will hold up to stock to mild V8 use, I've seen the cases hold up to V8 and be used in a doubler setup, these cases are pretty stout. the 1350 and 1354 share the same bolt patterns and dimensions, the difference is in the front output, the 54 uses a fixed yoke, while the 50 uses a slip yoke, the 54 rear output flange uses the larger u joints...And yeah, the adapters aren't cheap, they are floating somewhere around $500-750, and one TRS member that used the adapter said that there adapters are only 5 and 9 inch long adapters, and he needed a 7 inch adapter, so he ended up having to have custom shafts...Your "bolt in" options?? Use the 4404 tcase, the AWD case from the V8 explorer, downside to this case is no low range, no 2WD selectability at the case, will need to unlock hubs for 2WD, good points is its the lightest case of all choices, no mods needed and compact; use an NP205, advantages stupid strong, are bolt in, low range available, can be setup for twin sticks, all gear tcase no chains inside, somewhat plentiful, downsides are its all iron so its heavy, its a desired tcase so it may not be the cheapest case depending on your resources; Ford Dana 20, advantages are stupid strong, bolt in, small size, all gear case, twin stick available, super small compact design, not too expensive case and very reliable, downsides are you don't have one, they did come in jeeps (passenger drop) so make sure you get the ford driver drop case came in early broncos, popular case so finding one depends on your resources, it is an iron case so its not the lightest, but is desirable. I myself am going with a D20, but until I locate one I probably will run the 4404, only cause I have one already, I also have two 1356's...
SVT