If you place an order...you will (or at least in theory) get exactly what you want. If you take a chance to find one on a lot, you might have a hard time finding an SS for a while. I'm thinking most of them will be V6's.
When you order, I would just say...know exactly what you want. Get a printing out directly from the GM order workbench (that will have your order # on it). AND have them put in writing that your deposit is refundable and you will not pay over MSRP.
ECS-Paxton Supercharger / American Racing Headers & Exhaust / PFADT Suspension / DSS 9" 4.10 Rear / FOR SALE!
Powerfreak is the only one who actually understood anything.