hey guys, I found it

[Jeff H]

See if you can get some pictures of the Z28 engine compartment and especially the brake master cylinder area. Also get the information off the trim tag since the JL8 4 wheel disc brake option was only available for a time frame roughly around Feb through Jul of 69. Get the all the information off the trim tag on the firewall and get a picture of the tag if you can to help verify if it's real. Look for the X33 or the X77 on the trim tag to denote a Z28.