Maybe Garcia. I made an error above. I do apologize because I do admire your car very much but you have really disturbed the suspension and overall geometry of your car. See Xulfiqar's post for that matter, Rotary is a tiny engine compared to the mile long inline engine you now have. Your car is actually very good for hooning around, my type exactly.
Lets cut suspension out of the equation and just keep the word 'handling' so that we have all the variables attached with it.
But unfortunately, as easy as you made it sound above, that will not be it. Rarely anyone go for this swap around the world. In Pakistan, people couldn't understand the rotary and how much better it was then any of the JZ hence we go out for the swaps.
Tumbling end over end is what we'll be hearing consistently.
Cheers mate!