looking at ur plugs it seems that u are running rich. i dunno what to say about pistons and gasket. Maybe it was flooded. Run a carfax report on it and see what it comes up with. If it is out of state the salvage/flooded title will disappear. Run some ATF thru ur engine for a clean up. make sure you are gonna use your old sparkplugs 'cause it foul them big time. To run that thru the engine just get the fuel pressure hose out, stick it in a bottle and rev the car around 3k rpms. make sure u are gonna do it in a remote area with no nosy neighbours cause it will be very hard to explain to the fire dept. why all that smoke.
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