The Supercar Registry - LOOKING FOR 69 Z28 ENGINE PARTS

I am looking for the following components to complete my 69 Z/28. car build date is 03E (5th week of march 69), engine assembly date is 0218 (feb 18th 69) block casting is B109 (Feb 10 69). from what i understand, i need parts dated before the engine assembly date right? does it matter how long before the engine assembly date the engine compenents are dated?? or just as long as they are before.

1100837 alternator dated before 9B18
1111489 distributer dated before 9B18
1108367 starter dated before 9B18
nos 3953692 or 3937170 water pump dated before B189

thanks! tommy