WTB: V8 K member for my duster

Looking for a small block V8 K member for my 76 Duster. I dont know whats going on but I'm thinking mine is a /6, cause the top of the drivers side mount it trimmed, there are washers on both sides and the drivers side just touches the engine block, and it has a 318 in it. Gonna run some numbers tonight and see if it was a /6 car. Really want to make this right!!! I had rigged up stuff!