The running issue could be down to the velocity stacks being fitted over the air filters instead of directly onto the carbs. They might also be a bit long to allow idling and low-speed torque on a road car.
It might be nothing to do with the stacks, but from tuning (proper) minis years ago I found that the 'A' series was very sensitive to intake tract length and the old Triumph four pots aren't that different in design.
Well done for finishing the car, I always liked the Monaco design but looking at the width of the cockpit now I doubt I'd get one buttock into the driver's seat...
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