Its got a Voith D863/4 transmission in it. Which means it has the cummins ISL 280hp. It should be a screamer. This is the first sub 35ft that has a voith that i have seen. Most come with Allison 300's. But the allison 300s come with ISC's. So if its has a voith then it has either and ISL or an ISM. It also means that instead of a wood bottom, its made of 1/2" thick piece of stainless steel
And you are right, its 29'. For some reason measuring a bus is an art and not a science. Ive seen low floors listed as over 10ft wide, because they measure end of mirror to end of mirror.