67 Barracuda project... narrowing 8 3/4 rearend

Thank you guys for your replies, I measured my housing and it seems to be a little over 52 inches (think A body width should be 52 5/8"). So if I do go with the 9" should I shorten the driver side by the 2"? Are there any shops or mopar guys out there that provide turn key narrowed ford 9" setups for our A body cars?

I'm not married to the QA1 I just heard they were a good quality product. I do plan on spending money on this project but of course don't want to spend in the wrong direction and I do have a budget. I'll probably have to do this in stages, right now I'd like to tie up the drivetrain and not have to revisit it later on. I was looking at FRESH BUILT NASCAR DODGE MOPAR R5 P7 WET SUMP ENGINE pump gas 745HP 540 ft-lb torque for the engine. My ultimate vision for the car is a corvette eater both on the track and in the curves lol. (Top end is not important to me). Track days are important but I want to keep the manual trans for the fun factor on the street and for cruises. I live 30 minutes from Deals Gap US 129 :) so handling will be very important. The next portion of my build of course will be the front end so any input on that will be greatly appreciated, up til now I had planned on the QA1 suspension for that with the flaming river steering column and manual steering box.