Who's Idea Was It To Put Engine #s....

[THE "10" SILVERADO]

Just to start off, who's idea was it to put the engine number on the engine next to the transmission? It is a very big PITA to get to.

Alright, off that soap box. I have been under the assumption that my engine is a 307 based on what the previous owner told me when I bought it, I wasn't to concerned about what the engine was because it would be replaced anyway...well I got curious this weekend and checked the numbers out for myself. I could not find the identification numbers on the pass. side. Banged my head good a couple times trying to see down there to...but I did find a number on the drivers side that was interesting "3970010". I don't see this as the casting number for any 307s but I do see it as a number for the 69-79 truck 350 engine.

Is there any other way to find out if it is a 350 besides the pass. side number? It's really hard for me to get down there and I don't want to have to strip down me engine to get back there.

Thanks