1978? 360 with 318 heads why?

Any 318 head would give a CR boost and especially the closed chamber 302 and 318 heads wouldn't be bad on a 300hp torquer 360 or 350hp with larger valves and porting but if the engine stock it's more than likely the 360 needed heads and had the 318 heads already on hand or got a great deal on them or thought its was a 318 so order 318 heads or something like that.