water pump 140?

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The bolt spacing on the front of the head is the same so you could use either water inlet/thermostat housing. Your problem is that if you stick with the 140 housing it will line up with your radiator neck but will need a bypass blocked off and have no way to mount a fan and belt pulley assy; the 100 housing won't line up with the radiator, but will allow you to mount the old style fan and pulley assy which will line up with the old style water pump. This would require the old style front pulley with the wider fan belt but be aware that the pulleys mount differently as well and you didn't mention if you are trying to use a 140 or 100 style crankshaft which would have the narrow or wide pulley respectively.

I realize that the engine will bolt in; my comment about it not being a "bolt in swap" may have been more clear if I had said that the 140 and 100 blocks are not a direct interchange. I have done the opposite of what you are doing (put a 140 block into a Super C) and that exercise was the basis for the comments. Going the other way you may find some short cuts that weren't open to me? I even recall custom machining an old style pulley once to fit a newer crankshaft but that was a different project.

Possible? Certainly. Simple as bolting on a different style water pump? No.
Stan(VA).

If you want block part numbers SA is 354898 R1, 100 is 354898 R2, 130 is 366204 R1 and 140 is 367825 R2.

Not impossible, but not a bolt in swap either...
Stan(VA).

Happy Fathers Day :)