Looking for some advice with this one.

'89 240 in the uk.  This is the non-fuel injected version.

About 6 weeks ago, I had a suspected manifold inlet gasket failure.  
Replacing the gasket did seem to cure the problem.  However, the
problems returned shortly afterwards.

I am now told that they have checked the manifold gasket and there are
no air leaks but the problem was the base gasket on the carbereta.

So, I had this replaced.  No improvement.

I am now told that I need a replacement carb.  The dealer is telling me
that they are expensive.  

So, having been without the car on and off for around a month (see
previous postings), I am getting a bit frustrated.

So, to the dilemma Do I give up and scrap it (dealer says I could get
another car with fuel injection for less than a new carb?
Or, should I try to find a secondhand one but this could be just as bad?

The dealer also states that the non-fuel injected versions were
problematical which does not bode well.

Other factors.

May need a new clutch soon as this one makes a noise when pulling away.
Car has 9 month mot but did need some welding for the last one.
It has 175k miles.
Any advice appreciated as I cannot decide what to do.