Do a search for an IH forum by Red Power Magazine, get a log-in and ask this question. There's service techs that post to that forum that can assemble IH 300 and 400 series engines blindfolded. Both engines were used in ag and construction equipment as well as trucks. SON drove medium duty trucks ALL over the eastern half of the US one summer. Company bought worn-out soda delivery trucks, lots of DT-466 powered trucks, and some DT-360, and 427 gas engines in a few Chevy's, and SON made the mistake of getting in a DT-360 powered truck once, he claimed the company's only IH 9.0L truck, the full time drivers all had the DT-466's spoken for.
Same design team designed both engines, lots of common design, but I don't think a 466 drops right in where a 360 was.