I haven’t started my Godzilla yet, but I believe I’m using the Godzilla spacer plate (LC3Z-7007-A) with the 6R80 inspection cover and the Godzilla starter. You need the Godzilla spacer plate because it has holes where the engine’s bolts are (not referring to the bolts that connect the engine to the transmission). I tested the inspection cover for the 10R140, but it didn’t fit.
As for the starter, I would think you’d want one that is designed to start the large Godzilla engine. As I’m using the Godzilla spacer plate, it should line up just fine.