Hotchkis 76 Dart Build

Wow this is an incredible build. Shame there is some nonsensical bickering. Anyhow, i have a question. I see the tunnel cut out for the transmission. Is that for normal fitment or because the engine is sitting higher than the factory position?

Driveline clearance. We recently did the same thing to accommodate a 46RE in a 68 Dart. Driveline and pinion clearance get really tight. Might as well free up some inches if you have the chance.