76 Duster

I am new to the Mopar world. i just got a 1976 Duster. it was originally a 6 cyl. car, and now has a 318. not sure what tranny. A guy on craigslist has a rebuilt 518 tranny for sale for $500 comes with converter, and flex plate. My question is, will the tranny bolt up to motor? And will I need a different drive shaft or anything like that? I know the dip sticks are on opposite sides the 518 is on the driver side, and the one in my car is on the passenger side.