340 swap concerns

I have a 1974 Duster with a 318 / 904 set up. I am considering swapping my 1971 340 into the vehicle, but I want to make sure that I have all my bases covered.

What engine mounts do I need to use?

The 340 will mate to the 904 with no problems, right?

All of the current 318 underhood components are what I meet for the 340, correct?

8.25 axle should be ok?

Thanks for the help. If I have missed something please let me know

Pete