heads and intake manifold set up for 318. j heads available.

Since we are on the subject of 318's and heads I have a question also. I have a 73 318 and 85 318 police heads. Can I put these later model heads on that early of engine? Would there be much of a performance gain? Since the 85 police heads are casted as 360 heads can I run a 360 intake on it?