I have a 164 with a aw 71 I adjusted and changed the Bellhouse (from Huke Basart)

I measured all the holes in the original b30 flywheel-flexplate to fit the aw71converter it is as far a I know right in the center of the gearbox so it should work properly .
renewd the sealring in the front of the gearbox but i leaks like hell this is the 2th time that it happens I do not dare to look anymore because the last time I did I found that the bearing came out as well .
at first it drives very well all gears work also the 4th which is the od .
then it starts to leak out of the sealring the oil pump has no damage at all so the torqueconverter is not out of balance .
However there is slightly room for adjustment maybe to put it e few mm´s more to the gearbox could that be the fault that the vingers of the converter are not properly in the box .
Is it possible to fill the axial space with something behind the bolts between the flexplate and the converter .
I could do with some help here all the rest is al right the adjustments on the axle like shortening etc etc.