Yes, I can view that OK.
I did up the entire drow vampire. One of the main things I changed was the claws to slam, and bite drain. It doesn't have claws. I've read the write-up, and I've read a couple of adventures with drow vampires. They just have a dread touch that drains its victim's fluids.
Attacks that drain hit points in AD&D are normally translated into doing Ability Damage in third edition, or Ability Drain if the damage is permanent, so keeping the current Blood Drain is far more in keeping with the 3E ruleset.
You'd need a good argument to change it to permanent hit point damage from the 3E standard of ability drain.
Also, permanent damage of 1 hit point is a lot weedier than the Blood Drain the drow vampire's currently got - on average it does 2 Con damage, which means the victim loses 1 hit point per hit dice and has their Fort save drop by 1. Even in AD&D terms it was a weaksauce attack compared to a regular vampire's ability to drain 2 energy levels per blow.
From what I remember from when we did that conversion, we basically gave it two claw attacks to give it something distinct from a regular vampire and to represent the "1d4+4/1d4+4" in its damage/attack line.
It's quite likely they meant this to be the creature's shortsword and dagger, but if so they mucked it up - shortswords do 1d6 damage, and according to the combat entry both its weapons are
+2, so in AD&D terms its weapons should have a damage/attack of "1d6+6/1d4+6".
Besides, if we are going to change the drow vampire's natural attack from a pair of claws (which I'd be happy not to bother with if Freyar doesn't want to change it), I'd rather make it a touch attack that does ability drain rather than a slam.
After all, the AD&D drow vampire does call it a "dread
touch". Furthermore, a regular AD&D vampire gets to add the +4 damage bonus of its 18/76 strength to the 1d6+4 damage caused by its energy-draining attack's "crushing blows". In contrast, the AD&D drow vampire doesn't get its strength bonus to its fluid-draining touch, which merely does 1d6+1 damage (1 point of "permanent drain" on top of 1d6 "fluid draining").
I see little reason to remove the bite attack drain. Real world spiders suck fluids out of their victims with their fangs, so what's more appropriate than having a vampire giant spider do so? Also, draining blood (or "fluids", if you prefer) from a grappled/embraced opponent is a standard ability of Vampires in both 2E and 3E Dungeons and Dragons, and I'd say drow vampires ought to be able to do so too. The MC entry certainly doesn't say they
can't.