the stock foxbody radiator does just fine as long as you put a good set of fans on it
we like to use the "Dewitt's Radiator" C5 Fan setup...
it fits perfect with the Foxbody Radiator, dual fans, and flows 3200 CFM...
another option, if you need to lay back the radiator slightly, is to use a 98-02 Camaro/Firebird Radiator... same dimensions but with a slanted filler neck.
the only challenge with both of them is finding teh right hoses to go with your motor...
(stock F-body Radiator hoses work with the F-body Radiator and an LS motor)