While I'd defer to the experts here, I have a couple of questions about this photo.
I magnified the image and noticed
1) the back of the spoiler shows no sign of stripes. Z/28 stripe delete?
2) the tail panel appears to have just the bowtie? No Z emblem.
Could this be an LM-1? Everything but the SS emblems, 350/295 horse motor, no stripes, and all of the fun. JMHO
Andy

How would you explain the 15" wheels and tires?

How can you tell it has 15" wheels/tires?

LM1 was a 350/255hp not 295hp. I would think with the front and rear spoilers and the rear bumper guards, most likely this is a z/28 and they sure do look like 15 inch wheels to me.

An LM1 would not have got the wider wheels either. Trim rings look deeper like 15x7 wheels are.

Like I said, I defer to the experts. What would be the answers to the first two questions I asked?
The LM1 was just a guess.
Close, but no cigar.

BTW, the drivers side door show the reflection of two guys watching the photo shoot.
Just hold a magnifying glass up to the screen.

Back in 1972 while I was 19 I bought a 1969 Camaro with a 350/295hp 4 speed with a 3:36 non-posi with multi-leaf springs with a factory tac/gauges and clock. It was fathom green with the dark green interior with 28,000 miles on it.

My LM1 had the original motor 350/295hp motor according to the POP.

Goodyear Wide Tread GT RWL tires are 15". They were original equipment on the 1968 and 1969 Z/28. Also on the 1969 COPO 9737 Sport Car Conversion.

Could it be a non z28 car with JL8 brakes which would give it the 15" wheels?

LM1 1969 Camaro

I believe you may be correct. The JL8 option included the 15" Rallye Wheels and RWL Wide Tread GT tires.