The automatic used with a 265 was a cast iron case Powerglide in the cars, or a Dual Range Hydramatic in the trucks, also cast iron, and I believe it used the same 4-point mount system as the manual trans models- - - -two mounts at the bellhousing and two at the front, with the trans tailshaft hanging free. The Hydramatic might have also used a rear trans mount. An aluminum bellhousing isn't up to the weight and torque load of an engine/trans hung from the front and rear.
Jerry
