You told us everything but what body it is.

Back when I swapped a 360 in place of a 225 in my 72 Dart there were no conversion mounts so I put a later style K member in.

I pulled the /6, then pulled the old K, then put in the new K, then put in the new engine and trans. Took me a full day but I got it done, had to as I was driving it to work the next day.

They say there are no such thing as a stupid question.
They say there is always the exception that proves the rule.
Don't be the exception.