Feel like a milestone has been made when i married up the Chassis with Engine / Trans,
Common in many early Holdens.
Rear Mount sits snugly between the chassis cross tubes, there is about 3 or 4 mm clearance to the tubes, may need to be relieved a little more pending how much the engine moves around.
The rear mount sits on the Classic Revival mount supplied with the Chassis.
All the bolt holes aligned perfectly.
View from the LH rear.