The dash harness wouldn't be different so the power leads should be there. The speaker wiring probably not as I don't think radio delete cars would get speakers, maybe the dash but I highly doubt any rear speakers. I had a 87' Monte SS parts car which was a factory radio delete car(UL5 RPO code), had an older stock style radio in place (forget the brand, but not Delco) and the rear speaker wiring looked like GM wiring but the colors were a little different, guessing it was added later. Had different than stock but stock style rear speakers as well.
GBodyForum is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to amazon.com. Amazon, the Amazon logo, AmazonSupply, and the AmazonSupply logo are trademarks of Amazon.com, Inc. or its affiliates.