I think this core meets your criteria
I found this core at AutoZone for $18.99 and it is big enough to cool a compound waterblock setup easily.
1990 Chevy Caprice Heater core
Detailed Product Information
Description: Heater Core
Part Number: 94530
Dimensions : Height 9-1/2" Width 6-5/16" Depth 2"
Hose Connection Tube Sizes: Inlet 5/8" Outlet 3/4"
Vehicle and OEM Types: GM: 3022696, 3036422
Only problem I see with it is the tubes are oval where they join the tank, but if you are mounting the 1/2" barbs on the tubes there should be no problem.
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