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You are right that Formula Junior engines are very similar to F3, but they can be a lot more expensive.
A top Formula Junior engine can cost well over 10,000 pounds!
That in itself accounts for a large part of the price difference, and the 5 speed box is a bit more expensive (you should be able to get one for 3,500 pounds).
But the Junior is a lot easier to drive - the single air inlet for an F3 engine really does restrict the airflow and the revs, a Ford junior engine uses 4 inlets and has a much wider power band.
You also have 5 speeds in a junior which gives you a bit more choice of which to use!
Given the F3 & FFord gearboxes are the same you could convert the Brabham to FFord by 'just' changing the engine - a FF engine should be under 2000 pounds.
But I think you will also need to change the wheels - FF should use a standard steel road wheel. Plus the other bits that have been monetioned.
I think you should investigate the Envoy junior that is for sale in Germany, it could be quite a nice car.
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