High pressure in radiator?

Ok after many fixes (crap patches) I've discovered the radiator cap is actually being hit by the hood. I relocated the rad 1" lower, but am convinced this has to be replaced. Keeps springing leaks because of the flexing the old copper beast does.

Question now: 2 core or 3 core whats the difference overall?

And until I get the answer / shipped radiator what jeep cherokee year model (as i've read will do for the short term?)