My basic conversion philosophy is somewhere between WotC and Necromancer Games. I want to be true to the feel of the original, but not have a strict, slavish aping of the source text. I have freely altered the numbers of monsters and treasures to better fit a 3.x game. So if a "newer" monster better fits the feel or level of the adventure than what was in the original, I will use that instead. If the original text had 16 goblins in a 20 x 20 room, this translates to an EL 5 encounter if you use a strict one-for-one conversion. I would have no problems, though, converting that encounter as 6 goblin warriors 2 -- still EL 5, but more playable and a maybe little more logical.