strong 4 speed

[vennard]

I know most people on here are either doing or dreaming of 5 speeed boxes. BUt what I am going to have to do for the mean time at least is strengthen up a 4 speed and put up with it.
With this in mind I am slowly building a 1914 turbo that is mostly for the weekend and a bit of strip use.What should i do to strengthen a four speed from a 72 bug to handle this kind of power. Please explain in simple terms as I have had no experience with the inside of gearboxs to date.

Cheers

Karl