Sorry I just saw your post.. I have a 1956 Plymouth , I went and dropped a 440 and t- flight in it,, because I had one..Believe me a small block is a much easier install..The R/B has clearance problems with headers and the steering column.. At first I had the stock K frame and frame.. later I installed a K frame from a 1986 Chrysler 5 th ave..now I got disc brakes and torsion bar suspension and P/S.. still fighting the exhaust..later I stroked the motor to 493 cid..can't put better headers in .For a street car I would go 360 cid ,,its a bolt in with the FMJ K frame.I'll try to send some pics...