Yes there is an adapter that mates the Reid SFI rated bellhousing to the modified transmission case using the front pump bolts (the stock cast bellhousing is cut off). This eliminates the need to use adapter plates and spacers and makes for a cleaner install.
It does require a custom torque converter. I got mine from Precision of New Hampton. They have the measurements I used to end up with the correct spacing. I'm also using a 360 Magnum flex plate with an integral tone ring for my OBDII EFI.
It is a CNC'd piece from Lonney at Extreme Automatics. He also builds and has some serious performance parts and complete builds for a 200R4's and others.