Clutch/flywheel cover question

[ChevyLvr4Life]

I just replaced my clutch this past week and noticed that sometime in the truck's past someone removed the clutch/flywheel cover and didn't put it back on. I have found one that I'm looking to buy, but it came off a 6 cyl. w/ 4 speed. Am I safe to assume that this will bolt up to my 307 w/ 3 speed? It looks just like the one Classic Parts has in their catalog. I was thinking that the bottom part of the bellhousings were all the same. Anybody know? Thanks in advance. Here's some pics of the one I'm looking at...