The UB220 is the industrial version of the BD-220 six used in the trucks from the early '50's. Yes, the C-221 is derived from the same BASIC design.
That said, the BD [Black Diamond] engines came in a straight-valve configuration [early engines], and a tilt-valve [later engines]. The tilt valve has a wider valve cover. On the truck engines, if you put the pistons from a tilt-valve engine into an engine with a straight-valve head, you end up with around 13:1 compression...and usually major overheating, until you figure out what you did.
"Better" is a relative term. IH went to the tilt-valve engine because the straight-valve engines developed a reputation for hanging exhaust valves open, after which the piston would lop the head off the exhaust valve, with a bit of noise and a distinct loss of power. Tilt-valve engines weren't known for having this problem.
Others may know better about the bellhousing patterns. I'd wager they'd be pretty close...but I've been wrong before.
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Today's Featured Article - An Old-Time Tractor Demonstration - by Kim Pratt. Sam was born in rural Kansas in 1926. His dad was a hard-working farmer and the children worked hard everyday to help ends meet. In the rural area he grew up in, the highlight of the week was Saturday when many people took a break from their work to go to town. It was on one such Saturday in the early 1940's when Sam was 16 years old that he ended up in Dennison, Kansas to watch a demonstration of a new tractor being put on by a local dealer. It was an Allis-Chalmers tractor dealership,
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