Depends on year model. The 6.7 is a newer Cummins engine, likely, and I believe these are DEF / DPF - equipped. Way too pricey to start with, even for the miles, but the emissions issues are likely to be an expensive lesson best learned from others' experience. Keep in mind, my experience is mostly heavier stuff in Class 8 semi tractors.
My $0.02 - as an over-the-road trucker with 400,000 miles, one engine I was not a fan of was the Cummins ISX - we called them Cummaparts for a reason... I honestly wouldn't touch a diesel after about '02-'04, but the '04-'07s aren't quite as bad as the '07-'08+ models. 02-07 are mostly EGR-only, which isn't too bad (MaxxForce / PowerJoke 6.0 / VT365 excepted, they are junk IMO), but the DPF / DEF showed up between 08-10 and made things a lot more ridiculous (and expensive).
Cummins 5.9 (earlier ISB) and 8.3 (ISC) are good engines, and the 6.7 may be an okay engine being in the ISB family, but the DPF / DEF aftertreatment systems can be a nightmare that can ruin the whole experience for you should it decide to take a notion to malfunction.
I think you can do far better for less money IMO. $10,000 for a bus is a bit much.
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