If you have a blown headgasket I would think you would have loss of compression in one or more cylinders. A blown gasket doesn't always mean you are going to have coolant/oil cross contamination.
Get a compressioon checker and a Haynes manual (for the compression specs.)
With the checker screwed into the spark plug hole you can turn the motor over (but not start it) and have some else watch the gauge.

I think you can borrow a compression check gauge at Discount Auto or the other stores. Basically you buy it, use it, and they give you your money back when you bring it back.