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My other option is to do the unthinkable. I have a plan to mount the master cylinder ahead of the carbs and actuate it via a custom made 3/8" steel dowel pushrod. I would need to fabricate and weld reinforced mounting brackets to the left frame rail to mount the master.
That's not so unthinkable, my bro inlaw did it with his 1200. It is a RHD car, but with the CA18DET he fitted there was no space for the booster on the firewall, so he mounted it ahead of the strut tower. He manufactured brackets from angle iron and flat bar, which was bolted to the chassis and strut tower. It works a charm, and he hasn't had any problems with it yet, after 2 years.
Also the square shape MK2 Escorts all have their brake boosters mounted like that out of the factory, and the MK1 Golfs, you call them Rabbits I think, all have elaborately linked boosters on the opposite side of the car.