I spent the extra $$ and had my trans builder (Extreme Automatics) cut off the factory bell and use a Reid Racing (BH060 — Reid Racing) bellhousing like shown in the pic. With the Reid housing there is no need for an adaptor - the trans will bolt right up to my 360. The same Reid bell would also bolt up to a Gen 3 Hemi.
I also had my trans built with a manual shift, reverse pattern valve body. I'm also using a high-stall lockup converter. It's going to a fun driver.