Filter is on the bottom, one of the first things I changed when I got he boat.

The motors water pump runs off the cam shaft *and can be pron to leaks at the cam seal, so it is a good idea to change the anti freeze every season.

Set timing 4 degrees BTDC @ lowest rpm you can get, even better to use and advance type timing light and set for 32 degrees @ 3100 rpm. Make sure if you do this the boat is in the water. Running off the muffs *may not supply enough water for cooling.