i suggest you get the c50, the C52 have longer gears, so loose some acceleration.
i counsel to get the engine that goes with the tranny (im not sure that a 4A-FE go on a c-50), for a c-50, it would be a 4A-GE redtop or bluetop(the redtop is the best of the twos) you also need a pedal set, a shifter (with all the cables) and the clutch cylinder and all the tube that go with it.
you can get a tranny for the 4A-FE (dont remember the tranny number, sorry

)
also there a chance that you need to change the ECU, since some settings are not the same (idle higher on the automatic one, ect)