I asked the same question.
According to the VIN (HS30-101207) mine may have been manufactured in a period where there is some conjecture about which chassis was used, there are a couple articles floating around that suggest the early 260z chassis may have been used for the last of the 240z badged Z's
Or maybe he is suggesting that someone has done something dodgy, I guess when it stripped backed to mental we will find out :-)
As much as i would love to go the dipping/blasting route the project should be called "DivorceZ", so until the "noise" subsides I have to be careful of spend :-)
So this is the process I will be following:-
1. Air scape the interior sound deadening (Completed)
2. Air scape the under body protection (Completed)
3. Remove residual 'tar' with turps and a scotch brite (90% complete)
4. Paint stripper the entire shell
5. Sandblast to finish (i have a small sandblaster)
6. Epoxy prime
7. Start repairs
Yes, long, messy and unnecessary but i am in no hurry - just over the moon to have a project :-)