I have a Summit racing electric water pump on the BBC and the BBC with this Water pump actually measures 1/2 Cm shorter than SBC with long pump !!! it kinda amazed me...
As you can maybe see on this pic. I have one pice front end.
As with the SBC (not the one on the photos) i didn't have any heating issues at all... never. and that was with std water pump.
The summit pump flows 40 Gpm... which is hopefully plenty.
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hope you guys can see any thing.
The fan blade on the sbc didn't have any clutch, it was just the fan blade (aprox 1/2" deep)
Regards.