Can you put an engine from a Porsche 911 into a Porsche 356?
 

My customer want to put the more powerful 6cyl. engine into the classy older model car. They are both horizontally opposed, in line, air cooled engines. And the model of the cars are very close. But I don't know if one will fit the other. Or if so, what kits, mods or converstions are necessary.
VAG-COM 15.7