Baloney - You are TOO that old! Thanks to the anonymity of "Social Media", you could be some old 600 pound stay-at-home guy named "Virgil" with an internet connection. 
I had that same clutch tube separation happen and ended up cutting a rectangular hole in the passenger side of the tunnel for access to apply my usual terrible (but strong) weld to the tube and hanger. Mine wasn't nearly as far over the top of the tunnel or as fancy-looking as what @IaM-Ray showed (and I wasn't installing a hydraulic clutch), but it's functional and covered with carpet so, Who cares? Nobody's ever gonna see it but me, it removes with six screws and now it's super-easy to change the clutch cable every fifteen years!
I took the rectangular piece out and pop riveted a 3/4" wide strip on all four sides drilled with two holes each and then used sheet metal screws to attach it back to the tunnel.