Need pic of mack truck with a 427 in it?

An image search for "Mack CH600" or "Mack CH613" should do the trick. Most line haul CH series trucks had the E7 engine, normally rated at either 427 or 460 horsepower. Those will have a decal on the lower part of the door which will say "E7 427", "E7 454", or "E7 460" - those with engines with lower ratings do not have this. Also, if you look on the Wikipedia page for Mack trucks, there's a photo of a green Mack RD688 quad axle dump truck, with the company logo, truck number, and license plate blacked out. I can tell you firsthand that truck has the 427 E7 in it, Eaton-Fuller 8LL transmission, and Mack axles with 4.17 rear end gears.