Not to worried about the tail shaft because I have to get a new driveshaft anyways. My main concern was the converter. I'll do a good inspection on it to see if I can find some numbers and post them to see what I came up with.
As mentioned, the weights on the converter are there to balance the externally balanced 360 engine. If you use a 360 you'll either need a converter with weights or use a B&M or TCI flex plate that takes care of the balancing so you can run any neutral balanced converter. If the driveshaft connects via a slip yoke your ok. If it has a bolt on yoke it won't work in a car. I've seen both types in RV's.