How to ID LS7 to LS6 clutch?
 

What are clear identifiers of a LS7 VS a LS6 clutch and flywheel package

I found a great deal on a kit locally guy claims is a LS7 but does not have any supporting paperwork or stamped part numbers on the clutch

The LS7 flywheel is a "stepped" or recessed design. If you google image search the ls7 and ls6 clutches, you should be able to determine the differences.