Cup final at 12:00 please help me with formation tactics tips

Hi guys, at about 12:00 I will play a Cup final with a stronger opponent.
Till now I beat hard opponent of my same quality or a bit stronger, but this guy is definitely stronger.
The medium quality of my best 11 is about 65-66, his medium quality is about 70, he has all scout players.
He playd with classic 4-4-2 in first rounds but recently he has bought other scouts and in last round he used often 3W-4-3
Can you give me some tips about formation and orders?
Wiesse and other great coaches, help me :D