Hi there, sorry to hear about your engine situation - I have been there, so know all about it!

I must admit that when I first read your post I immediately thought cambelt...but someone else mentioned that, didn't think about the tensioner..
However, couple of things to consider, firstly, I am not sure if it is the picture angle, but the chain tensioner appears to have moved and is no longer square to the head. If this has happened then the mounting screws might be simply bent, but unfortunately they can also be pulled from the head and damage the threads, or in some cases actually crack the head casting under the tensioner. This area will need a good inspection if the tensioner has moved.
Secondly, as you have lost quite a few cam teeth, they have no-doubt found their way down the oil galleries into the sump. This is not the best place for chucks of metal, especially with the crank whizzing around down there. So, I would advise a good inspection of the oil galleries on the exhaust side when the head is off (it is going to have to come off as you will most likely have bent some valves

), and then the sump needs to be cleaned out to remove all the nasty metal swarf.
There are a few 16V 3L heads with cams on eBay at the moment, so they might be worth considering. I replaced my entire 944S engine with one from a donor car when my cambelt shed teeth and 7 valves got bent. The replacement cost of new valves and the associated machining, etc. meant this was actually the cheaper and faster way to go. Easier to do all the oil seals and other 'stuff' too..on-the-bench!
Not fun...whatever you do...your wallet will take a hit!