1964 mercury 65hp long shafe exhaust tube

HELLO
PLEASE BEAR WITH ME TH

HELLO
PLEASE BEAR WITH ME THIS IS MY FIRST POST.
I HAVE A GOOD RUNNING 1964 MERCURY 65 HP
I BOUGHT THIS MOTOR LAST SUMMER AND IT HAD A BAD LOWER UNIT THAT HAD BEEN TAKEN APART AND NEVER PUT BACK TOGATHER. SENSE THEN I HAVE BOUGHT ANOTHER LOWER UNIT AND INSTALLED IT.BUT THE MOTOR HAS NO EXHAUST HOUSING IN THE MID SECTION THERE IS AN EXHAUST HOUSING SEAL OR GASKET ON THE LOWER UNIT THAT I BOUGHT. MY MANUAL DOES NOT SHOW THIS PART IN THE BOOK DO I REALY NEED THIS PART AND WHERE WOULD I GET ONE
IT RUNS FINE BUT HAVE NOT HAD IT ON THE LAKE YET WAING FOR THE IMPELLER. THANKS FOR YOUR HELP DAVID

Early ones did not have that.

Early ones did not have that. What is the serial?
That would lean the motor if the exhaust was not sealed and was supposed to be.

THE SERIAL NUMBER IS 1712278

THE SERIAL NUMBER IS 1712278
I NEVER SAW THE EXHAUST HOUSING ON THIS MOTOR. BUT THERE IS NO TELLING HOW MANY PEOPLE BEFORE ME HAVE HAD IT APART. ANYBODY ELSE HAVE ANY IDEAS OR HOW I CAN TELL IF IT IS SUPPOSED TO HAVE THAT PART OR WHAT WOULD HAPEN IF IT WAS RUN WITHOUT IT THANKS

"According the the EPC, that p

"According the the EPC, that part does not show up in that serial # range."