I have a reference book called "The Standard Catalog of 4X4's" by Robert Ackerson that indicates the 230 engine was introduced to the Pickup in 1963 and the serial numbers started at 55278-10003. This would agree with what is on the S/N Tag.
His serial number is low in the series so the truck could have been purchased in the Fall of '62 when the new models came out and mistakenly registered as a '62.
The fourth digit 7 indicates an OHC 230 engine. The L226, which they were still making, would have a 6 as a fourth digit and a much higher number for the final 5 digits.
I agree that the title numbers are wrong as you surmise. The 3 should be an 8 and the first 0 taken out.
The book doesn't give production numbers after 1955.