Know any good old school dungeon crawls?

[Mouseferatu]

[blatant plug]

If you're looking for a dungeon crawl with a slight twist--but still very much a dungeon crawl--and if you can wait a little while, you might want to consider "The Hero Snare " from MonkeyGod Enterprises, coming out (I think) in November.

It's for slightly higher level characters than you're asking about--somewhere in the 7th-level range--so you've still got some time.

[/blatant plug]

 

[roytheodd]

Rappan Athuk and Tomb of Abysthor from Necromancer Games

You won't find any better.

Ditto.