335i to 325i

[Z3zima]

Ive got a 06 325i 6 speed. Body is in really good condition.
Ive just recently bought a 09 335i it runs and drives no issues no codes, just no title. Was a mechanic lean.
So what im thinking of doing is swapping drivetrain. Putting the 35 into the 25 but i sortve want to keep the manual. I know I should probably get a 335i manual trans.
Has anyone swapped 335 to 325? If so any guidance.
Ive got time and space for it. I know it’s not plug n play but I was looking for guidance but im determined to make it happen