None of that portal to another universe stuff that superman COULD use. Just pure strength between all of them.
No super powers: Kamehameha or Ice breath or eye beams
Goku can't telleport but he can fly
Super man can fly.
Week of prep time.
Oh and we are talking modern age super man.
Goku if he wanted, could only go SS 1
And this hulk would be, the hulk that is pure rage and is seperated from Banner.