rrc engine swap

Hello to everyone. Could someone be kind enough to inform me what kind of gearbox will be ideal to mate with a m51 engine from an Opel omega, in order to swap it in my 1992 range rover classic. Or if the gearbox from the omega will mate straight to the BW transfer box. Thanks in advance

I would have thought the auto box from the P38 could be adapted as that mates direct to the M51. Doubtful you could use the Omega box as it's not 4WD.