235s to 1953 were prefixed "T" so far as I knew, and "C" was light commercial 216, "X" heavy 216. The number might be a 1953-54 unit...can you tell me what the casting number is please on the side of the block, and the casting date code nearby? Thjis will be in the form of letter-digit[s]-digit. The casting number might be next to a "GM" such as 5845388.