Yup, the other guys pretty much covered it. 12V71 Detroits were pretty common in Brockways, but only with the longer hood models. Depending on the way the AITM interior is cast, you may need to modify the firewall to make the engine fit. I had to do that on the one I am building, as the real truck had a cut-out in the firewall to allow for the engine to fit, and the resin interior did not have this detail (since it was not made with the intent of having the hood open). The cab I got from Dave is still a very nice piece. For the exhaust, you can easily use pipes from any kit, as exhaust stacks are pretty universal. I tend to make my own using plastic tubing though, as I don't care for most kit exhaust pipes due to seams and mold lines. 7/16 diameter tubing makes for great mufflers, and 3/16 tubing makes great exhaust pipe. I use perforated brass sheet painted with chrome paint as heat shields over mufflers.