Quick/dumb question- how to visually identify a 340 vs 360 vs 318 (with a 4bbl)?

crawl under the car on the drivers side look above the starter there will be a number the last 4 didgets will be for example 340-5 or 360-3 or 318-1 the last number could be from 1 to 9 i hope vthis will make it easier for you.