Original Avengers VS some DC heroes
Original Avengers members, but with some modification.
RK Thor, Professor Hulk, Iron Man (in best armor), the Wasp (lol) and Henry Pym (with both Giant Man and Ant Man powers) VS
Superman (regular), Wonder Woman (regular, no sword or armor), Captain Marvel (regular, not the current guy who's the new Shazam), Aquaman (regular) and Atom Smasher (who I know pretty much nothing about)
-No speedblitz
-PIS and CIS are on
-Nobody is pre-Crisis
-1st scenario no prep time, 2nd is 10 days of prep (in that instance, Batman won't be involved but will be allowed to give prep to the DC characters because they don't have any geniuses on that lineup and the Avengers have Iron Man, Doctor Pym and the equal of Bruce Banner)