6.0 LQ9 4L65E swap 71 GMC 2500

[RR440MAN]

My son and I are restoring a 71 GMC 2500 and swapping a 6.0 LQ9 with a 4L65E. Today we stabbed in the engine and transmission into the chassis for a test fit prior to removing for media blasting. We fitted the engine plates and mounts onto the stock perches. It looks like we are going to have to move the engine further rearward on the plates as we are having difficulty clearing the perches with the passenger side header. There is an approximate 1/16” clearance of the passenger side perch. The engine angle and transmission appear to be approximately 2.5-3 degrees so I think we are good. The long tube headers will necessitate either fabricating a new transmission crossmember or purchase one with provisions for a 3” exhaust clearance. What trans crossmembers are you guys/girls running to facilitate clearance for a 3” exhaust? Attached are photos of the build.