That is awesome! If I didn't have a rallye dash I might have done the same thing.
The 3.91 gear with the OD must be realy nice. I have a 5.9 running factory EFI with the 46rh with a 3.23 gear. The 3.23 is is nice on the highway but really the bare minimum for spirited acceleration. I'm just about to put a 53 mm throttle body on the engine, then I'll have every go-fast part you can possibly run with the factory EFI. The next logical step for me is a gear, probably 3.73.
