noticed water leak (slow drip) from behind WP pulley on enging 5.7 LX 350 1996. No temp problems now I was going to wait a couple of weeks till i winterize to change out water pump. How difficult is it? have manual, tools, and some basic know how. also will probably do pump in o/d this winter. What is a decent price for pump? I know it has to be marine.<br /><br />Thanks...