A 1961 4x4 might have had a 261 engine? That would be the Alpine Green color (I think people say the Detroit Diesel Green is good match?).


1962 235 truck engine?

http://www.1954advance-design.com/Web%20images/PPIP/PPIP-1912-1966-EngineColors.html

You might consider the dark gray sold by The Filling Station for 235 engines.
http://www.parts123.com/parts123/yb.dll?parta~partsort

Tim