Power steering? If manual the following info is worthless.
In my 66’ Barracuda, I switched to Borgeson steering box. I’m running Doug’s headers with my 273 auto- center console car. The box (if available to you) and the new coupler made a huge amount of room and the box fluid runs 20degrees cooler than it did with factory box. The new box is also about 15lbs lighter as well.

I hope this info helps as I am not trying to sell boxes. But headers in these cars are tight let alone with power steering.
Hi Syleng

Yes it's powersteering, but is what I believe is the original power steering box. Thanks for the advice. It's a really tight fit, and it's just so frustrating!