does anyone have know the correct # of 69 z28's that were built with the radio delete. thank you

Oh, I don't know - 25~26 - Thousand* Camaros that year didn't come with radio's...

It isn't a "delete" - it was an option to get a radio. You didn't have to delete anything - just have to enter an RPO-code to get one on the order sheet, if you didn't, you got the standard cover plate - or as we now know it 'the radio delete plate...'
Many dealers installed the radios themselves after the cars arrived - the more options they put on at the dealership the more money they made...
Man I wish I would have known they were gonna be worth something :( they went right into the round-file as soon as they came off the cars I was prepping...
I think I have one, maybe two, from a couple of trucks I ordered B-I-T-D without a radio option.

Hope this helps confuse this issue even more :)
John

* taking the % of "Z"'s that year at @9% of total production, that could put the total number that could have been ordered without a radio (if the percentages tracked even - which I bet the don't...) at somewhere around 2400~2500 cars - hopefully the CRG has some better/closer fiqures than this based off actual unit counts...

John DeLoreans 1973 book "On A Clear Day You Can See GM" has several comments about GM business tactics of the day. Dealers that routinely ordered cars without [Delco] radios were certain to be visited by a Zone Rep who would explain the consequences-allocations cut, orders delayed, etc.

High volume dealers might get away with it on occasion but in general Chevrolet did not make it easy to order cars without, in a sense making some kind of radio de facto "standard" equipment.

No one has any idea how many 69 Z/28s were built without a radio.