Make sure the 360 has a rear sump oil pan. The one from the 318 won't work. Also, 360 motor mounts are different than 318. Pretty sure the flywheel from the 318 is balanced differently than the 360.
Huge has it covered. The flywheels have different balance between the 318 and the 360. You need the 360 balanced flywheel, torque converter, or flex plate with the 360 motor.
That said, you will need to separate the bell from the motor and you will have to remove the clutch to change the flywheel. If your dealing with an auto trans, you either need the 360 balanced torque converter, or a 360 balanced flex plate.
I've not experienced it myself (didn't want to take the chance), but I have heard that the 318 flywheels on a 360 give enough vibration the whole car/truck shakes at an idle. Just in case you considered using the 318 stuff.
