Although it is a LOT more work, I would agree with the previous statement about getting a G6 6-speed manual for it instead. I have the V8 Archie kit in mine. I have a Diablo kit with an LT-1 and G6 6 Speed manual. It is pretty sweet. Part of V8 Archie's kit is the flywheel changes needed and the clutch/pressure plate, etc. Then you'[re able to get replacements pretty easy too. But then you're in to axles as well. But anyhow, it is a LOT beefier than the 5 Speed and the axles that are used with it.
Looks like a great car! Enjoy!
Thanks,
Coop