1959 Canadian GMC trucks came with a 261 engine. Look for captain's bars just behind the starter The M in the square shown in the picture indicates it was manufactured in St. Catharines Ontario. The serial number will probably start with a W.

1954 Chevy 1300 engine 235 (1959)
1955 (first series) Chevy 3100 engine 261 (1957)
1927 (other brand) Model T- engine 327 (1968)