Slant 6 to 340 Engine Swap in 69' Dart

Removing the Slant 6 and installing a built 340 in an automatic trans 1969 Dart and have some questions.

-The car has air conditioning and power steering stock. Any issues with keeping both as long as I can find brackets that will mount them on the 340?

-Can I use the same transmission and trans mounts the Slant 6 used (providing I beef up the trans internals)?

-Can I utilize the same wiring harness?

I know Ill have to upgrade the 7 1/4" rear end, the radiator, the drum brakes and get the correct motor mount adapters, but are there any other "gotchas" regarding this swap I need to be aware of?
Thanks.