Dave
The truck was left outside for some 35 years with no engine cover and the roof hatch open.

53 monster
For 99% it should be used as an anchor.The main idea is finding out the age and size of the engine.

Jerry
You are right about the size of the engine the c15 was using,it was a 216.
So far I also know that this truck should be made between late 42 to mid 44 only try to get a more accurate date.
I am familiar with the later 216 engines but never seen this shape before

Thank you all.
Jianis