Anyone have any experience converting a 265 with Torque Drive converter and Fluid Drive M6 tranny to a Powerflight tranny and converter??

Chas,
Have you contacted Wilcap Adapters in CA. They make trans adapters for flathead to some GM's automatic transmissions. I considered going for it, but found a 55 Plymouth flathead with a auto attached. I am not sure if they have anything for the 265.

carb37