I think the problem is solved. Spoke with:

http://www.fortwayneclutch.com/index.php/

And the tech guy knew right away what the heavy duty clutch I was talking about was, and even said there is only one pressure plate for it, and its not a common one.

Price is $275 + $100 core (I have the core, no problem there).

Jim Carter and Chevy's of the 40s simply didn't have any answers regarding the clutch and could only use vague answers like 'should fit' (but wouldn't pay return shipping if they were wrong).