Bellhousing question--will it work?

The bellhousing that was in my 68 \6 3-on-the-tree Barracuda only had a bolt pattern for the three speed tranny. I had to get a new bellhousing to install the 4 spd.

Can't imagine that yours is going to be anything different. The 4spd bellhousing I got had both patterns and you could would see the two lower holes for the 4spd with the 3spd bolted up. So crawl under the car and take a peak. If you can see another set of holes you likely have a bellhousing that is designed for both.