you have a Z code car. most Z code cars were a one of a kind car. (only car to exist with the options your car had) it had to be ordered by the customer with an out of the norm procedure. for example, my dad and i had a 70 442 W-30 that was sibring yellow with a light blue stripe and light blue interior. this was not a standard option of Color combo. that made it a special car and was given a Z code. what options do you have. all three of the Z code cars i seen were optioned with many options. power everything. contact me so we can talk Oldsmobile's. i would like to know more about your car. congratulations on finding a Z code car.
i have a 70 Rallye 350, 67 442, 91 quad 442 W-41, 70 442 W30, 72 442 W-30, 67 cutlass 66 ninty eight, 70 vista, 76 ninty eight.