69 302 or 70 LT1 balancer?

[PapaSmurf]

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: ZLP955</div><div class="ubbcode-body">The number on the block face is the casting number and the 4 digits on the front are usually the last 4 of the GM part number. I'll see if I can find out what '1947' is in any of my reference books.
Timing mark relative to keyway looks to be in the right spot for a 69-on application and as the guys have said, the short spokes are typical of later service replacements and 1970's factory style balancers. </div></div>
Would different build dates have different balancers?
The car is a Sept. 3, 1969 build date &amp; the engine is original to the car but has been rebuilt once