You can youtube it. They make an actual leakdown test kit that measures the percentage of the leak(nice but not necessary). I use the hose from my compression tester. One end threads into the spark plug hole and the other end has a male air hose fitting. Put the piston at top dead center of the compression stroke (both valves closed) and pressurize the cylinder. You may have to hold the rotor to keep the crank from spinning as the air pressure will try to push the piston down. While the cylinder is pressurized, listen for air leaking from various areas of the engine; exhaust, valve cover breather, intake manifold or carb, bubbles in the radiator if it has one, etc.
The 351 is in a 5 speed fox body mustang, and it does scream. Fun car to drive.
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