How to find largest value and its position in memory array?

I suggested:

always @ (posedge clock)
       begin 
             if (Enable) 
                   begin
                        if (din > max_val)
                           begin
                              max_val <= din;
                              Q_val <= Q;
                           end
                          Q <= Q + 1;
       end 
end

you need to take care of verilog syntax and rules as I am not good at it. You also need to take care of address latency.

I also thought you are reading from memory but your code suggest are just writing to an array from din?? so which is'it? Anyway the code for din above should work in principle. what you do with din before/after is your focus.