How can you tell if a engine is GOOD....?

i have a EG8 D15B 1.5 Single Cam Black top fuel injected engine....my Crankshaft pully give way %26amp; i decided to change my engine .....but i'm ONLY buying the HEAD %26amp; BLOCK.....%26amp; i'll use the other parts from the old engine......I'm buying a Foreign Used engine (Head %26amp; Block) what i need to know is %26quot; How can you tell if the engine is a GOOD ENGINE ...?%26quot; In the auto places i visit... the Engine is lying on the ground in a row %26amp; all you have to do is choose a engine %26amp; the guy will strip it %26amp; take out what you paying for ....it's like you paying for something with just takin their word for it that it's working...... Can Anyone tell me what to look for on the engine that tells me that the engine (Head %26amp; Block) i'm buying is working properly.....thanks alot Another thing can anyone tell me what is the difference between a Black Head Engine %26amp; the other kind without the black head.....How can you tell if a engine is GOOD....?i own a repair shop,and there's really no way to tell without tearing it down and checking everything in it,you basically are taking there word for the engine being good,i have bought a lot of used engines before,and i have gotten some bad ones before,salvage yards or junk yards will sometimes stretch the truth a little to sell an engine, what it is some cars they buy wrecked,they cant start the engines,and hear them run,so thy gamble on them,and then you gamble on them telling the truth about them,they will always give you another engine when one is bad, but the labor your out changing them isn't paid for ,so you loose on it that way,but really your going to be taking there word that's its good ,i hope this help,s. good luck.How can you tell if a engine is GOOD....?its a gamble either way on a used one.

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How can you tell if a engine is GOOD....?make sure the rings are bearings are good and u have good compression..and no oil leaks,check the sealsHow can you tell if a engine is GOOD....?the best you can hope for is spark plug,s with some mile,s on them......they can tell you a story........pick up a champion spark plug catalog .....they show picture,s of various plug,s %26amp; the condition,s they opperiated under........they can tell you if it,s an oil burner,or if it had been runing hot,or too lean,etc.........available at most automotive retailer,s.How can you tell if a engine is GOOD....?Do a compression test and a leak down. This will give you a good idea of what it going on inside the engine.