RX-Sizzle

Im a little new to the rx-7 scene. Ive been building mustangs for years and have decided to simply change bodies...not drivetrains. So my question is for anyone who can shed light on the rear-end swap to an 8.8 ford. I've heard narrowing is mandatory and then again Ive heard it isn't. Im sure someone on here has already been through this headache and may be able to help me out. My car is an '81 Rx-7...Just looking for the least amout of work to acheive toughness that the 8.8 has...I know there are advantages to the 9' but I have many donor 8.8's. And to be honest with the Moser stuff they very stout as well. Just have to run the c-clip eleminators. Thanks for any input...Ryan NC