Mine is more like the NASCAR type. I got lucky when I purchased it. The radiator was on closeout and scored it for $400 or so. It's really too big for the car. If it was 3" narrower it would be perfect. And no, it does not come with any sort of fan for $625+. The good stuff is going to cost more up front, but in the long run will be less expensive than having to do it all over again.
The hottest the oil has ever been was 240*, and that was with a 106* ambient, 130*+ on the track, 20 minute session with the old iron 406.
I don't see why your tank could not be modified to accept a cooler. The question is, as Tom points out, is how much will it cost? If it could be done for less than 1/2 the cost of a new radiator, then OK. If more than that you might as well sell the one you have and buy the Big Kahuna.
I don't think you will be happy with an undercar cooler. Too many compromises and likely an ineffective system. Think of how PO'd you will be if you found out it was not effective and you had to go the in-tank heat exchanger later on? $$$$$$$$ and time (that's free.)
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