Here's a pic of the right side front detail of a 72 Dart frame connector tie in to the TB Crossmember. I'm installing a cage in this car, so I also added an outrigger/gusset to support the roll bar mounting plate. One issue with the typical frame connectors IMO is they mount to the side of the TB crossmember, and nothing really internally transmits force forward, I welded up the inside spot welds, I added two internal gussets, and the welded in oval tube is for 2 fuel line's passage. I do think Domingo's solution is a more robust and audacious solution to the problem at hand.