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BTW, that would not fit ANY fourth-gen, but only the LS1 fourth-gens.
Why do you say that? No matter what, it's going to take a little fabrication to fit up to header collectors. No reason why you couldn't fab it to work on an LT1.
but with the right headers, it'll slide into the 98-02 F-bodies, Angle is different for the LT headers... Sure with fabrication, it'll fit a 65 Mustang. . .