Which position on a distributor cap for a mercruiser 140 boat engine in # 1?

Question

And if you can verify the firing order as 1-3-4-2.

Answer 1

I thnk 1-3-4-2 is correct.

Here is how to tell where to put the wires. Remove #1 plug, place your finger over the hole and "bump" the motor over until you feel compression (you can do that by hand). Then look and see where the rotor in the distributor is pointing. Put that wire to #1. The wire directly opposite will be for #2. Do the same for #4 plug, and then #3. You will have verified firing order, and wire position.