'69 Barracuda T56 swap, floor, cross member
Ugh, that sucks!
Looking at that bellhousing though I think going to the QuickTime will solve some of your issues with the tunnel. The QT itself needs a couple of small modifications depending on the T56 used and throw out bearing used. I know on mine with the T56 magnum snd C5 corvette throw out I had to do a little grinding to clear the clutch lines and things. Of course I bought my QT bell quite awhile ago so they may have updated it, not sure.
Your bellhousing is small block to T56 right? Does it fit a GenIII hemi? I might be interested, I’m still looking at options for my Challenger and it would have a larger tunnel…