IF I would have bought this, I would have just sent it to the goodmark installation center in Georigia. For +/-$15,000.00 they will send you back an entire car built around that firewall (less finish body work). No VIN or TTag swapping needed. No violation of any laws.
http://www.goodmarkindustries.com/GIC.htm
Personally, if it is a L78, then I think that it is well worth saving.
Rich