Any Problems Using This A904 Transmission

I've got a A904 (ID: PK4412001 8905) from a 86 Chrysler 5th Ave.

I want to use in for my 1970 Duster with the original 318.

Is this a good version of the A904 or is there a better one to find?

Also, is this a A998? I'm not too sure since the manual I have says its a A904.

What do I need to know when converting this from a 3 speed manual to the A904?

Thanks.