This is not a Yenko Monza, but it is as close as I could find, it is a Nickey Monza. Actually, the real neat car here is a Nova, of course. This Nova is maybe the coolest dealer built car that I know of, imagine it, a 75 Nova LN. This car was only intended to steal a few sales away from the Ford Granada, no driving excitement allowed there. But with a 454, this is the ultimate sleeper. You have to click on the third link to see the Monza information. So this post is only partly on topic, sorry. It is from Super Chevy Magazine.
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This last link is not for a Monza either, but it is also kind of interesting to a Monza enthusiast. It is a Motion Corvette Spyder. This is from Chevrolet Performance Annual, 1977. It looks like a 77 Spyder stripe kit and four 76 Monza Spyder emblems added to a IMSA style Corvette. Off topic, but very cool. I wonder where these cars are now.
http://www.sonic.net/bbdon/free/cospyder.jpg