As it sits, I've probably only got 3/4" of clearance between the transfer case and the LHD rack
3/4" !!!!!!! Most of us are lucky if we even get 1/4" clearance between the RHD rack and box in a b-series!! You d's have all the luck!
I can see where you have snipped the front end to let the header stick out......you might aswell show off the internals until you sort something out with the grill