Do you know how to read compressor maps and have access to a turbo calculator?
It sounds to me like the stocker turbo is so far outside it efficency range that it's only blowing hot air. Add your super-sweet 80's technology OEM intercooler and your asking for trouble.
-Dave
What psi and what turbo? 80 degress above ambient is substantial.
Before you go swapping incoolers, I would check your compressor maps and make sure your in its efficency range.
-Dave