2005 Honda Civic blown head gasket?
The motor runs but I can't test it since it's not in the car does this oil leak necessarily mean the head gaskets blown? 
Check for water globules on the dipstick, or traces of oil in the coolant.
If so, then the gasket's blown.
The gasket could be damaged and letting traces of oil seep out, but not enough to be actually blown.
It may not be blown but it's on its way out. You'll need to replace it sooner or later. Easier to work on out of the car.
That's minor and the motor may run for years that way. If you have oil dripping and running down the side of the motor and leaving oil on the ground then I'd replace it. If you have trouble with no heat at idle remove the radiator cap and run the motor for 20 minutes to see if you keep getting air bubbles in the radiator neck. That's a bigger problem then minor oily dirt stuck to your motor because it leads to over heating and seizing up the motor.
It means nothing and it means everything. You can look at the leak and tell as much as anybody. Have the engine compression tested. Check the crankcase for emulsion. Sounds like you're buying a used engine. Reject it unless they offer a guarantee of no less than 30 days. 100 day guarantee is common where I live. That usually means no leaks, good compression and in running condition. If there's failure within the guarantee period they have to get you another one. You'll be stuck with installation cost.
All of the above
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