Well, first, yes the heatercore can handle two pumps. They're typically tested to 25 psi, and that's the equivalent of 17.6 meters of water.
You'll want to put the pumps in series because:
a) they work better that way (thanks to Airspirit)
b) it'll give you more pressure (which is good!)
Unless you're running two seperate loops.
I used to say that the waterblock should follow the core, so that the rad can dissipate the pump heat, but I was wrong, and anyways, the pump heat is relatively insignificant.
What we all found out is that the pump benefits from an unrestricted inlet (thanks to BillA), so I'm inclined to say that the airtrap/res should come before the pump, but that wouldn't be an accurate description of the solution: the pump inlet will benefit from the largest possible diameter, so if it's possible/necessary, use a bigger tube for that particular connection.
If you're ready to go ahead with the two pelts, you might think about getting either the largest (and/or thickest) heatercore that you can fit: you're reaching a very high load of heat.
Fans for those heatercores will be critical: pick wisely.
Good luck!
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