As I said it's what you are willing to do. I have a set of 1 3/4" TTI's that were slated for my car and with one tube flattening it easily fit around my Borgeson box (RB block.) There is a member on here who did a set of 2" TTI's with a factory steering box.
It's a tight space making it fit no matter what. If I had to do it over again I would get a raw Driverside header and cut/refab/weld and then coat it. Why TTI doesn't address this is beyond me but that's the reality of it.