LOL, the RB anything does not "Bolt in" to any Z31 chassis. You will need the NLA 200ZR crossmember and engine mount brackets. You will also need the NLA 200ZR transmission mount. As Benedict said, take a look at my build up and you will see what needs to be done to make any RB fit into a Z31. Here is a link to my hybridZ writeup.
Rb Z-31 - HybridZ