The water outlet setup on the engine will determine inlet/outlet requirements. The common aftermarket setup is driver's side lower WP outlet.

Mancini has a nice high volume water pump+housing package. That would be my suggestion. Or re-use the iron housing with a Mancini high volume pump.

As far as fan either will work. If you go electric you need something much better than common aftermarket units. A big OE fan is best. The Lincoln Mark III or IV fan is supposed to be good or Feet's Mercedes setup. With an electric fan, you need a big alternator, temp senders and heavy relays to set it up. Personally I like the simplicity of a thermal clutch mechanical setup. Basically OE.

With a really good fan, the Champion 4 core is a candidate - may work - but need to check inlet/outlet and fan shroud fit. A made to order Mancini muscle car radiator or similar from Griffin would offer better cooling capacity but spendy. A high end OE replacement for a 440 truck would be an option also. Same comment, need to check inlet/outlet locations.