[Dominik]

I reread the replies two times, but can't figure if you checked the cam lobes.

if they are not opening the valve wide enough (worn) you won't get enough air/fuel into that chamber to get a good compression reading.

as for the engine discussion:
we have some very pooly powered Cobras in Germany.
Ford V6 2.6 or 2.8l (150 cui) and i have even seen one with a VW beetle engine in the rear.

but maybe that has been the starter for the tank engine in the front - maybe not!

dominik