200-R4 transmission behind mopar stroker

200R4 is roughly the size and weight of a turbo 350, takes the same rear yoke as the powerglide, turbo 350, and most all GM stick transmissions. That makes it fit better with fewer modifications to a recepient chassis than than the R700 or any of the T400 based transmissions. Earlier versions were non electronically controlled allowing a simple wiring hookup using only a couple of wires to control lockup and other functions.
In stock form it has a well deserved reputation for substandard internal parts made offshore. That said, the basic design is sound and there are aftermarket replacement parts from a number of venders available to address the issue of inadequate, inferior, and just plain lousy OEM parts, enabling the transmission to withstand power levels said to split a R700 case in half. Desirable valve bodies are from the turbo Buicks, Monte Carlo SS, or based on them.
Of all the rear wheel overdrive automatics out there, the 200R4 is probably the easiest to fit in our A body chassis, if you get your mind around non Mopar parts in a Mopar.