putting a 440 in my 69 340 dart

You'll need the oil pan with the notch in it to clear the steering linkage. I forget the part#, but you can find them all over Ebag.

The bell will work w/ the 340 tranny.

Have you checked out bigblockdart.com? They have some tech pages dedicated to some of the issues that arise when doing a BB conversion. I'm sure that'll answer a lot of the questions you have.