ok i have had another look at my box situation! without the convertor on the box the input shaft is pushing against the crank!! not good, as though the bellhousing is too shallow..

So i need a favour off someone that has Silvia auto box lying around, i need the measurement from where the bellhousing bolts to the box and where it bolts to the engine(so the length of the bellhousing), just to confirm if the bluebird housing i have wont work.. Needed pretty urgent too guys! i may be interested in buying one too if they are different

cheers