W123/M110 : intake manifold gasket leak

The intake manifold gasket is leaking at a couple of the cylinders. Idle is terrible, especially when the engine is hot. Spraying the intake manifold
with starter gas, revs up the engine. I have changed all injector o-rings, so they cannot be the cause of the problem.
Anybody with a brief how-to change the gasket and what maintenance should be done at the same time ? I'm thinking of engine mounts and if i will have to change any other gaskets along the way ? I have to use a DYI-shop and want to have the needed spare-parts by hand (apart from the new intake gasket and refrigerant, that is).
My impression is, that the gasket is pretty difficult to remove, without having the car on a lift - not much place to reach in, from above ?
The car is a 280CE '84.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
Add image file

Motorsforum.com is a website by car enthusiasts for car enthusiasts. It is not affiliated with any of the car or spare part manufacturers or car dealers discussed here. All logos and trade names are the property of their respective owners.