Doctor Doom with a week of prep versus the Mighty Thor (classic)
Doctor Doom's skills on invention are well-known, he has made a time machine, a gizmo that sucked power cosmic and as a last example, his own armor. So, can Doom take out the most powerful Avenger?
I would say it's pretty even, a slight advantage to Thor because he has showed some really amazing tricks. Please try not to use godblast as an explanation.