3" TTI exhaust out the back

Ive got a 68 Barracuda. I'm getting ready to put an Eddy pro flow 4 EFI port injection on my 408 but I want to upgrade the starter and exhaust first. I would like to run 3" TTI headers and pipes all the way out the back but I've been told that there will be fitment issues at the rear spring mount. looking at it, I don't see an issue.

Anyone out there running 3" pipes out the back on a 67 thru 69 'Cuda?