Hope you don't mind, I thought I'd post some updates on my Brickling re-furb progress.
So far I've:
Re-wired the doors / replaced the main rams and tested using an external pump to pressurise the tank.
Replaced a faulty Holly Carb with a new Edelbrock 600cfm quad barrel unit.
So today I started stripping down the front of the car to replace a leaking radiator and give me access to install an electric air compressor for the doors.
I think I've found the problem with the Air con too!