Originally Posted by bungler

Indeed that doesn't seem to correspond to any of the A330 layouts. Are you it's not actually a B777? In that case 39 would be the last 3-4-3 row and behind that ought to be 3-3-3 until row 44. The seat map does suggest that the middle seats (D-E-G-H) up to row 40 have a good amount of legroom, so they're probably a good choice.

Hopefully someone with recent direct experience can give you further advice.^