How to check pulley timing mark?

["Bob D." <bobmgtd@insightbb.com>]

I'd like to check the accuracy of the timing mark on the engine pulley.
Would a simple stick down the spark plug hole be adequate for finding TDC?
If not, what would it take?
 
 Bob Donahue (Still stuck in the '50s)
 Email - bobmgtd@insightbb.com
 52 MGTD - NEMGTR #11470
 71 MGB - NAMGBR #7-3336
 .

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