[Jack21]

The 351W didn't come out until 1968. If the car is an early '60's it didn't come with a 351W. Are you looking at an FE? You'll have to look on the block area above the starter for the block casting code. It'll say something like C9AE ('69), or D2AE ('72). The first letter is the decade; C='60's, D='70's. The second digit is the year.
The "C1BA", if that is the block casting code means it's a '61. The 221 small block was introduced in '63. In '64 it became a 260, and a 289 in '65. If it is a '61 engine, it's probably an FE, and probably a 390. That was Fords bread & butter engine for sedans.