well u cant really do coolant presure check with it out of the car. compression test is a must!. look of the engine. remove the oil cap and not any gunk around the lip and any white coolant around the cap.. white noramally means coolant leak(blown head gasket).. check seals. u got engine out cheack rear main. turn the crank over a few times.. if the engine is really bad it might make a noise. inspect belts. check tappet cover gasket. check sump seal. check if the nissan stickers on the exhast cam have been ripped.atleast take a plug out inspect tip. look down the plug hole inspect carbon build up.
get a warranty on it.
what is the purpsose of the engine? gonna drop it in a gtst? a silvia..? hope it helps.