I too have a 1983 380SL and like yours mine also has just over 44,000 miles.
I've owned "Angel" since new.
I think you got a great deal -- hell would freeze over before I would sell mine for $7.5K.
I had mine converted to dual row timing chain in 2009 when it had 40K miles on it.
Not cheap to have done -- the engine has to be pulled. But, when done, you will find
the engine tight feeling like it was brand new. I could tell the difference when I
got mine back out of the shop.
Years ago I contacted Mercedes complaining about the single row timing chain and
talked to a Mercedes rep. He told me that not all 1983's were single row and he
wanted my VIN to discern. Unfortunately, mine was the single row chain. You can
take a dental mirror and flash light and look down in the Oil Filler hole to see
if the chain looks like a bicycle chain or if it is a wider dual row chain.
A 30 year old car with 44K miles is something special and I bet the condition
of your 380SL is superb.
Keep on this forum. There are a lot of DIY instructions here to do various fixes.
Unfortunately, you won't find converting the timing chain a DIYer task. But
many other things are very well documented here and the folks on this forum
can help you with a lot of tasks.
Post some more pictures of your 380SL so we can see what you got.
BTW, my website shows the disassembly of the 380SL engine when mine
was converted to dual row timing chain:
1983 Mercedes 380SL
"You have chosen to drive a MERCEDES-BENZ, a car in whose construction and production we have taken great pains because we believe that quality is not a matter of chance." -- page 3, Owners Manual 380SL
Timing Chain, Subframe, wiring harness, Climate Control, Rust prevention, etc.