Clearance issues with new headers.

untighten all the bolts on the passanger side motormount lift engine alitle,tighten them up again,that might give you just alitle more clearance by just using the tolerances, if not enough see if you can make a shim to fit betwen transmission and its mount.. still not enough? floorjack under collector and push it up,might just gain alitle clearance further forward.
might just help

sorry just noticed im way late on this subject.