Jeff, colour me confused by the Il-2 already is an anti-tank aircraft and designed from the start to be. They had various armament fitouts, including I believe up to 37mm, but not podded like the Stuka. The Ju-87 is the interloper, being developed into an anti-tank platform later.
I can't recall the company, but one of the Eastern European manufacturers did a run of Il-2s including the Il-2T complete with torpedo.
Regards,
John