Looks like you have made some good progress. Have you tried setting the transmission up into the tunnel at all yet? There are several fitment issues. The left side transmission mount on the body is in the way badly and will need to be cut out. The shifter will not line up with the factory hole so it will need to be trimmed along with the interior pieces. The bellhousing on the T56 is obviously a lot bigger than the R154. The firewall will need to be pounded out a bit, and perhaps even cut in certain sports for you application.
Your F-Body driveshaft is probably fairly close to fitting but I will almost guarantee you it will need to be trimmed. I am using an F-Body shaft in my car and I need about 2.5-3.0" inches trimmed.
Your F-Body driveshaft is probably fairly close to fitting but I will almost guarantee you it will need to be trimmed. I am using an F-Body shaft in my car and I need about 2.5-3.0" inches trimmed.