69 350 intake needed?

[wtexz10]

I'm starting to gather parts for the rebuild of my CE replacement engine and I will be needing an original cast iron intake manifold #3927184.  My car is an 05A build. I'm hoping my heads are the ones that came from my original engine.

I need a couple of things:

1.  What date codes would be acceptible for the build date?
2.  Other than ebay, where would a good place to locate a correct manifold?

Thanks and Merry Christmas,
Kris