should be a fun project, but you'll have some work ahead for sure, good luck with it and check in with any questions & updates
"what's possible" depends on the driveline and brakes - if it's an early small block, there's lots of crate replacements, but air brakes can present various problems and would need updating ... and FYI, "Greyhound style" buses have 'snub nose' flat faces due to pusher engines [
like my '47], that's a "school bus style" with the front engine
Bill