360 into a 318 car ??

I have a friend who has a 70 duster and its a 318 car, but he wants to install a stock 74 360. What will we have to do to make the 360 work with the 904? If IIRC the 360 is external balance and the 318 is internal balance so the 360 wont work with the 904 that is made for the 318, or will it work?