https://www.sjgames.com/dungeonfantasy/
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The problem with AD&D and C&C is low level survivability in a crawl.
Once they level up a few times and spell casters have more than one spell in their pretty little heads it gets better...
One of your earlier concerns with 5E was the lack of options. It still doesn't have the breadth of PF,but with Xanathar's and Volo's, there are a bunch of new races and class options to play.
It's less that than I want to avoid comfortable ablative HP pools. The HP growth in D&D and its derivatives just don't have the right feel for a game with horror elements. It comes through in a lot of the old Ravenloft stuff; they had to resort to weirdness like level drain and such to make horror even vaguely a part of a system built around comfortable controlled defensive resources.
you can do a dungeon crawl with savage worlds quite easily
Nothing says horror like exploding dice when a character goes from full health to 7 wounds in just one hit.
There are very good Horror and Fantasy companions for Savage World's, it handles both genres well
What about ICRPG? Index Card RPG. Very light and easy to mod.
https://www.icrpg.com/