With 3.55, your 4 speed granny gear will still be usable for pulling stumps, and starting from a stop up an incline or out of a hole. After that, the gear ratios in 2, 3, and 4 will be very similar to 1,2, and 3 of the 3 speed transmission.
I would go with the 4 speed/3.55 rear end gears before I'd go with the 3 speed/3.55 rear end gears.
Carl

1952 5-window - return to "as built" condition | 1950 3100 with a 235 and a T-5 transmission