The factory bell housing for the 143 tooth flywheel has about an
1 1/2"-2" wide flat space on the bell housing right where the bell housing bolts to the engine.
You can see the flat area where the bell housing bolts go into the block in the picture.

You can find bell housing part numbers at Brewers Transmission Website, if you need parts they are great guys to deal with.
http://www.brewersperformance.com/products.asp?cat=28