Aluminum Bell Housing

Searching around on-line, I see some small block bellhousings described as 9.5 inch and some others (they seem to be later versions) as 10.5 inch.

Are there any concerns with fitment issues? Want to make sure it will work on my Dart.

Thanks again - George

The 10.5 and 9.5 (there is a 11" too for B/RB) are the clutch/flywheel sizes. I don't think a 10.5" clutch/flywheel will fit in a 9.5 bell (I may be wrong). I think the LA 9.5 stuff is early like Pre-67?