how about a Y pipe arrangement so it comes out the pass side. it could still be a dual pipe if you want that. the booster is gonna cook otherwise. you could run a single large diameter pipe and get pretty good flow. not sure how air flow works exactly but fluid flow quadruples when the pipe size is doubled.
https://www.engineersedge.com/fluid_...ipes_14029.htm
ensure to make the cross member removable from the frame so you can swap out a booster or master cyl easy if you need to.
got a better pic of the ends of the cross member area? is the subframe extended back far enough to weld in some tube horizontally and then install bolts directly through that to hold the trans cross member? that would keep everything tucked up inside the frame so it doesn't hang down.