Also simplifying things was the fact that the 200 was/is the same length as the short 350; the only difference was a fixed tailshaft and further rearward mount on the overdrive. This may not be as relevant if you're swapping from a manual trans, but what is beneficial regardless is that the 200 is one of the smaller-bodied overdrives, which means you won't have to do a lot of cutting and splicing to fit.