1965 coronet 440/ 4 speed swap

oh wow I really hope not.... I can fabricate if I really need too but I can measure the 361 to the 440.
Sorry, You shouldn't have any problems, I was thinking, it's the 65 C Body that uses the big block A Body left mount bracket. Your 361 brackets should fit fine. Schumacher Creative Services has a lot of useful information on their website.