What is/are the actual failures?
A breakdown ( no pun intended) of the faults is the first step to sorting out the issues.
Analyse the failures and rank them by frequency.
Pick off each variation to cure.
Some will be easy and others less so.
Are they assembly caused by poor alignment resulting in stresses?
Poor quality materials?
Rad capacity not matched to the engine?
My trad Plus8 has a Morgan ali rad. The top mount came away from the tank. The bolt to cross member bracket was out of line causing stress on the weld. The weld failed and was peeling away. No leaks luckily.
My fix was a new steady mount over the rad tank, padded and in line. My issue is tha5 whoever fitted the rad ( a dealer replacement for a previous owner) must have forced the rad to get the mount bolt into the cross member bracket. A quick bodge. GRRR. Was it an initial factory misalignment of rad mount points or a rad bracket misalignment?
Yes, Morgans are hand built so tolerances likely to be less precise but why not compensate for these properly?