Hey! I came across a review of Gunderholfen and it reminded me of your comment. Yes, you could run it with TLM with 2 things in mind: 1) the dungeon seems to be quite focused on combat, it can be very lethal without HP in TLM; and 2) TLM is designed for 5 dungeon difficulty levels, so you should round them up two by two i guess.
How did the 1974 D&D experience turn out?