I'm currently doing similar swap on my 31 with a 235 engine from '58 car.
Use the 216 water pump and the relocation plate
Not sure what you're doing about the transmission end - I'm using the flywheel (and starter) bellhousing, clutch and transmission from the 216 also
Do you need to drill the cam cover for the forward mount?
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'51 Chevy 3100 Truck - OEM 216 Engine; three speed column shift transmission
6 Bolt disc conversion with dual master/vacuum booster
12V alternator conversion.
235 engine in waiting grin