4 in 1 fuel saver fuel pipes
What are they? What do they look like and what is the construction?
I would definitely get the head skimmed, as a slight increase in compression ratio can only help the performance and fuel economy - probably rather more than a dubious 'fuel pipe saver' I think.
The block needs cleaning up very carefully to remove the carbon and other residue from the failed gasket. Once done then it is a matter of checking the flatness in the area between the cylinders.
Out of interest, what is the thickness of the head? The original thickness is 2.75", and any less will show if it has been skimmed before, and by how much.
A couple of other questions - do you keep the heater valve open all the time and is the by-pass hose in place? The heater valve allows a good flow of water around the back of the engine and the by-pass hose does the same for the front. Yes, BMC did remove the by-pass hose on the A+, but they did NOT remove the by-pass system, just did it differently!
Once everthing is back together do make sure that the mixture and the timing are set up properly, as in a previous post, a small amount of over-advance can cause internal overheating and gasket failure, as can an over-weak mixture. Over-rich can cause wear and poor fuel consumption, but not overheating.