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Have you put coolant in it yet? If you have, and it's not leaking externally, or into the cylinders, it's UNLIKELY that there is a warped head or "junk under bolt", or "bolt too long" problem. Before tearing anything apart, I'd beg, borrow, or steal a cylinder leakdown tester, and apply compressed air to one cylinder at a time (with the engine correctly rotated so the valves are closed on the cylinder being checked). Following the instructions with the tester, this will give the % of leakdown for each cylinder, plus you will be able to hear where the leakage is occuring... past the gasket, past the pistons, or past the valves. If a leakage tester is absolutely not available, you can break the porcelain out of an old spark plug, and thread the shell for an air fitting, or braze or weld an air fitting to the remains of the spark plug. Applying air to each cylinder using this home-made fitting will not let you compare the leakage between cylinders, but you'll still be able to hear where the leakage is occuring. It will be interesting to hear what you find out with this project. My guess is crap preventing the valve from seating, or possibly cam timing problems.
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