I ran an LS7 clutch with an aluminum flywheel in my 346 build. Great clutch. You can use a stock LS2 flywheel for the LS7 disk and pressure plate. Whichever you go with, replace the slave cylinder and pilot bearing while you're in there. Be sure to add a remote bleeder. It could save you a lot of heartburn later.
Another thing to consider since they will have the drivetrain dropped is to replace the torque tube bushings. Now is the time to do it.
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