have you tried a auto filter removal tool?the hoses should be above the level of your fuel tank....just split them and peel them off...or cut them and
Lightly surface the head on a glass table with 200 grit and torque it to spec. Pull it down slow in at least three steps with a center out pattern. 216-240
as to the question on type of hose...use any good hose but not back rubber....
Depending on how far your willing to go new crankshaft seals wouldnt hurt
My boat had a rubber grommet around the drain hole and i have a piece of pvc that is a tight fit in the grommet...when i am going to run the boat and