I bought a 1977 240D from a woman that had a similar thing happen. Chain broke causing 2 bent exh valves, 2 broken cam followers, cam broken into 3 pieces, but no other damage. I installed a later cam & towers, replaced the 2 exh valves & followers, all guide seals & did a valve job while I had it apart, put in a new chain & it ran like new. Just because it puked some parts doesn't mean it's all junk. Just make sure all the debris is removed.
I'd do a leakdown test to see if the valves are still seating properly. Compression test won't tell you much with the chain skipped, plus you run the risk of more breakage. If it passes the leakdown test the head won't even have to be removed.