Battle's translation of Calvin's INSTITUTES Volume I
"Osiander laughs at those men who teach that 'to be justified' is a legal term; because we must actually be righteous. Also, he despises nothing more than that we are justified by free imputation." (page 738)
I only know what Calvin (& Battles) write about Osiander but this dislike of imputation surely is something that later found its way into Finney, though Finney probably did not know it.
Chris Anderson