I guess what I am wanting to know is if there were different mountings and accessory bosses on different years of 394's.
I believe this engine is a 1963 because it has an aluminum water pump and is labeled as a "skyrocket" ultra high compression engine on the air cleaner.
It is also painted red with chrome valve covers.
It looks like it uses the same front engine mount as the 371 in the '60, but it's kinds hard to tell for sure.
Here's a pic of the engine, it is in a 1961 Super 88.