Sounds like your pump is ok, since the pisser is pissing... (god, where do we get these names from...lol)...Anyways, since you are getting water flow my bet would be that one of your thermostats isn't opening. Remove them from your engine, put the covers back on and then try running your engine again. (Don't worry, you won't do any damage to the engine for that short a run) If it runs cool and the water doesn't turn to steam you've found your problem. If you still get steam then it's a good bet that you have blocked passages or hoses. To narrow it down even further, you can check where the problem is by just putting your hand on the heads of the motor after it heats up. If one side is cool and the other is really hot then the side that is hot is the side with the blockage.
My bet would still be on the stats though until proven different.
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1987 V20 w/1987 150HP Yamaha on a Shoreland'r Trailer
1978 16.5 Airslot w/1996 120HP Force on a Four Winns trailer
1996 V21 w/1993 200HP Mercury on a Shoreline Trailer
All towed by a 5.7L Hemi Durango.
If God didn't have a purpose for us we wouldn't be here, so
Live simply, Love generously, Care deeply, Speak kindly.
(Leave the rest to God) 
Silence, in the face of evil, is itself evil. Not to speak is to speak, not to act is to act. God will not hold us guiltless.
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