Mopar Performance M1 Intake for 340 motor

Can someone please tell me the serial number for the M1 Single Plane Intake that fits a 340 LA engine (not W2 heads)? I'm having trouble finding which one will bolt up to my motor. Also, does the port for the water neck belong in the middle or set off to the passenger side? I have a 70 Duster 340 4 speed and I'm looking to upgrade. Thanks and feel free to ask questions if more information is needed. I see so much conflicting information on this topic.