Re: 63/64 mercury 500 question
Don't know if yours is the same as my '77 500, but on mine you remove the front plate by twisting the knob, remove the 2 straps that hold the outside cover on, and then there is a latch near the top of where your chrome front plate is. The latch is right where the upper piece of your chrome piece fits in under the top engine cover. It would be right under the giant "5" on your cover. Again, mine is a '77, yours may be different.