306 derv box options

[bad driver]

I'm currently running a 306td with a n/a derv box. I'm thinking of changing the gearbox to a hdi box. Originally I kept the n/a box after the turbo conversion due to lower ratio for better acceleration. Can someone please tell me the ratios on all 3 gearboxes so I can compare them before making any firm decision. Also I need to know which way the clutch is on the hdi box as I know the derv box and the turbo derv box are opposite ways to each other. I have both a turbo derv and a n/a derv flywheel but I want to use the larger clutch assembly.