You would need an adapter plate as a SB trans will not bolt up to a BB or vice versa.

The ZF trans will be substantially larger so you will have to deal with restructuring your floor pan and torsion bar crossmember.

Final (and most substantial) issue is the ZF is electronically controlled. Unless ZF makes or has some sort of stand alone transmission controller, or unless you're a computer engineer, you're kinda outta luck.