Changing from BC/B5 to IB5 won't have any effects on the position of the engine!
There were to '95 Escorts with front starter IB5 boxes:
1.4 PTE (late CVH multi-point EFI type)
some of the early 1.6 16V Zetec ones
Both have shorter overall ratios than the S2. Ratios are nearly the same like the S1 had.
You can use one of these boxes with the shorter ratios, or you swap the internals with any other IB5 ones you'd like more or you do a hydraulic clutch conversion.
This looks interesting it s mean i need a escort mk5 1.4 efi box and than fix thé s2 lsd in it without hydralik pedal std fix on it