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No, The transmission Mainshaft spline is shorter in length on a C4 Corvette. Around 7/8" shorter I have heard.
Would require disassembling the IROC Transmission to swap out the Output mainshaft.
I have heard of a few people cutting the splined output shaft to what they need to meet their own needs without disassembling the entire trans. Used tape and shop rags to cover up openings. Then Using a Cutoff wheel to trim the output shaft.
Dirty way of getting it done.
But if you look at an original C4 700R4 Mainshaft-output shaft closely, it was cut off originally by GM with a bandsaw from a longer Mainshaft. You can clearly see the saw or tooling marks where the cut was made.
Where there is a will, there is a way to get it done as you want it.
Designer Imagines A Corvette That Looks More Like a Corvette Than the Corvette
Slideshow: A Jaguar designer's personal project imagines what a modern front-engined Corvette might look like if Chevrolet revisited the golden age of the Stingray.