i don't think brad the previous owner in 98 knows a lot I just posted what he said to me about the car.
I texted him the same pics of the block and he still says the car wasn't a z28 and for me to wake up.but like I said to him what are the odds he had year,make and model and vin car and I have a year make and model and vin block from the same city and town and it not be the same car.looks like factory GM stampings to me but I'm no expert either