What kind of bus? The only Thomas that had the isc was the rear engine'd transit, so if it's a conventional or front engine transit, it's got the 6.7. Even an RE transit would more then likely have the isb over the isc.
Regardless, in 2010 any bus would have had the full gamut of emissions devices(DPF,SCR, and EGR) installed. All first generation devices too, so you'll very likely have reliability and repair issues with it, at least we did on all the first gen units. They seemed to have gotten the bugs worked out on the emissions by about 2015 or so.
Seeing as you'll be driving this instead of parking it, I'd go with something else. Either pre-emissions(2004 or so) or after 2015. If you must go in that time period, avoid anything built by international. JMO
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