So Andrew, how's the 7th wonder coming along - I won't ask you, as I am sure you'd still be happy having purchased the car (especially in such nice condition), but have you yet sorted the suspension and is it running okay in other respects as well?
OK, sorry for the EXTREMELY late reply
o) but I've been away again and haven't had much time to do anything W116 related except drive them.
However recently things are less busy and now I've had to start working on my 350SE I'm getting right back into it all again.
As for the 6.9, unfortunately we haven't sorted out the suspension properly yet, however we are fairly certain it needs new cells in the front. Could be costly I understand, but shouldn't be a problem. It doesn't appear to lose much hydro fluid, but it does lose some. Besides that the car rises everytime it's started, as it sinks over time obviously, but it rises fine so that's good.
You can drive it, but you have to be really careful near any bumps or sudden (even small) changes in terrain or the front of the car will "bounce".
As such, it (the car) gets small drives now and then to keep everything nice and lubricated but obviously with this suspension ATM you can't give it proper Italian tune-ups
It's ok to cruise on the flat highway, but that's it really.
Bad suspension aside, the car is wonderful. It runs great, response and power is fantastic and it has a much smoother idle than the other W116's here. But they haven't had the same treatment this car has had in the past (i.e rebuilt engine parts etc).
I wouldn't be exaggerating by saying that the slightest increased pressure on the throttle and suddenly you notice it leaves most cars behind you for dead
The sheer effortless-ness and rapid yet, easy acceleration is amazing. The fact it's a '70s saloon makes it more so
Which makes the suspension even more of a shame ATM as it's a bit of a killjoy
But that will come in due time. For now, the 350 awaits as I try to get fuel flowing from the petrol tank (damn filter...)
EDIT: Also, forgot to add that fuel consumption on the 6.9 is surprisingly good.