4♥. I am worried that after 4♦, partner will show his club control 100% of the time and we may be too high. I could try a clever 4♣ and bid slam if partner denies a ♦ control. This also has the advantage that partner will also move afer 4♣-♦-4♥ with a real strong hand. On the other hand he may misevaluate his hand based on the false information, or he may have not have a club control as well. I still think pass is right, but If I bid, I would much rather bid 4♣