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Yeah i raced last year too...70 highboy with 4'' lift 38.5 boggers...raced in big block modified. I have a built 466 instead of the old stock 360 for this year though...hehehe
I went to the ford dealer ..Like a Dummy..and paid way to much for mine...but I have to have it..for a speedadrome run for my A/EA 48 fiat....but you can find them at the bone yard or have someone build one for you!!-Russ
Putting an electric fan in front of the radiator that already has the factory fan will act as nothing more than a baffle and will actually decrease the airflow through the radiator. It can't even come close to matching the CFM pulled by the stock fan, let alone add to it.
Since you are high revving the engine anyway, airflow through the radiator should not be a problem. As mentioned, if you have no shroud, by all means get one. The shroud is a vital part of the cooling system, and is too often discarded by shadetree mechanics.
I would also recommend a 4 row radiator.
An alternative would be a PROPERLY installed electric fan system. By this, I mean heavy duty. high CFM double fans with the proper radiator shroud, not an Autozone cheapo held on with zip ties. The advantage here would be that the fans will keep cooling even when you throttle down.