88 blazer 2.8-- how to loosen distributor?

thanks for any help
i want how to set the timing and know how-- BUT
i am not sure where to loosen the distributor.
i see one bolt , to the lower left (passenger side) at the base of the
distrib. --this bolt (approx 1/2" head) has a small star head bolt threaded into it.
is this the distrib. hold down? and what it the "star head" for.
any help greatly appreciated
thanks
bobby
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9/16th bolt head. From front of engine it will be on left side front of dist.
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no
the hold-down is next to the distributor 'shaft' which goes down into the block, passengers side, 9/16 head

it's an intake manifold bolt
used to gain clearance for the vacuum advance

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