oil pan removal on a 68 with 350 engine

[lt704]

I have a oil leak that looks like it is coming from the rear part of the oil pan gasket. My problem is that this truck came with a six cyl. engine and it now has a 8cyl. 350 engine. I want to change the gasket. It looks like the cradle will be in the way. Correct me if i am wrong but i cannot disconnect the motor mounts to raise the engine because the mount towers?? are connected to the cradle. Does this mean i will have to pull the engine to change the gasket? Thanks for the help.