The SOHC head is wider than the DOHC head front to back as you can tell by having to plug those 5 drain holes that a couple become exposed after that swap. The SOHC head has the thermostat housing on the front towards the radiator side and the DOHC has the housing on the tranny side. Because of the head being narrower and having to make the swing around the corner of the block you run into the clearance issue with the water pipe which some people run spacers to avoid but I would personally dent up the pipe unless I went bigger than a Td06 housing such as a 30r.
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