Stefano, did your friend buy that Z-28 off of cartraderonline? Sounds like the same car. Gold/white stripes,saddle interior, etc. Sold new at Nickey chevrolet. He had original invoice, etc. Only paperwork he had for any type of conversions were for the headers. Still retained its original drivetrain. LT-1, m-22, 4:10 rear. Owned it for 20 years and bought it off of the original owner. I think it had 21k miles. Out of Aurora,IL. I had an appointment to see it. He was asking $7950 for it, but I offered him 10k. He did get a better offer. I passed. It definitely never had an L-88 in it. If it did, it would be mine. Neat car nonetheless.