Electric VS standard fan
To me it is unclear about the mounting of the rad. Care to post a picture?
Good questions by mopardude318.
If your rad prevents you from running a fan shroud or big fans, yes, get a good factory style radiator first.
There is a thread on here about champion radiators, they seem to have good reviews and they are pretty darn cheap and they fit like factory.
http://www.forabodiesonly.com/mopar/showthread.php?t=149998
That thread..
If possible, get a 2 or 3 core aluminum radiator, good fan shroud, HD factory clutch fan. You can pull the fan shroud and clutch fan off a late 70s aspen, diplomat, volare (I think, someone else will have better info on shroud and fan source) . This set up will cool the hell out of your machine unless you have other major issues. If you get the shroud and fan from a car, you can get a new HD clutch for it for like 50 bucks.
A Mopar HD car clutch fan pulls about 5500 - 6000 cfm.
Secondly, not sure at what speed you are having cooling issues but if the nose of the car is high up, at speed it can be ramming air under the car which stalls air flow thru the radiator and works against the rad fan. A small air dam off the bottom of the core support will work wonders to help this situation.
You should be running a high flow 180 thermostat in the factory location and standard (non-underdrive) pulleys.
A stock water pump will most likely work just fine but there are high volume units out there I would imagine.
Usually there are a number of factors causing cooling issues as you probably know from your Pantera. All the details work in unison to cool the engine.
Happy holidays