you can call around to some insurance companies and try to start a "stated value" policy. Chances are you will have to make a complete list of what is on your car and its total value through an appraiser. Photos and what not are sent to the company and in the event of a total loss... you *should* receive enough money rebuild another Z....
hope this helps... unfortunately I think some of the companies will only do classics like this but its worth a shot
“… He spoke with all the righteous indignation of an ungifted artist denouncing the scapegoat whom he has chosen to take the blame for the lamentable consequences of his own lack of talent.” - Aldous Huxley