First off, Welcome to F-Body Online Nate!
You're going to need LS1 Mounts, the V6 mounts wont work and the LS1 sits a bit lower.
Do you know all of the other parts you're going to need or no?
- Complete Engine
- Transmission (different bolt pattern)
- Fuel Pump
- Engine Harness
- Throttle Cables and System
- New Susp. for added weight
- Steering rack
Just making sure you know what you're getting into. It's been done before, and if you've got enough of the parts it's worth the money. If you've got just an engine, it's most likely not worth the money.
Heres more specifics
3.4/3.8 V6 to LS1