Need advise bolting a np445 to a 325 poly

The 325 will need the adapter plate kit. Since it is the same as the early Hemi in regards to the bellhousing bolt pattern. The kit will come with a custom flywheel or spacer depending on which kit you get. I have the Hot Heads kit on my 331 Hemi and it uses a custom flywheel with a pilot bearing made into it.