Do I need flywheel alignment Dowel pins???

ok, im half way through my T-56 swap, Im trying to put on the Centerforce D/F and the directions say to be sure and use the alignment dowels if they were originally used. there are extra non-threaded holes on the flywheel and P/P.

is that what those are for??
where do I get the Dowel pins?

im using a flywheel from a 75 chevy 454 1ton
and a Clutch and P/P setup from a 72'454 chevelle.
thanx guys

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Justin McIver
Sacramento CA
66-454-th350