1955 Ford F-100 w/ 67' 273 & 4 speed

I just picked up my granpa's old truck. It has been sitting since 1980. I was told that it had 273 and 4speed that he swapped out of a wrecked 1967 barrcuda. How do I identify this motor? How do I determine if it is the "s" motor? What about the transmisson. I will start a thread soon so everyone (who wants to) can follow the project while I try to get it running.

Can you guys point me in the right direction?