In my search for a replacement date correct intake I noticed the 140 to 234 change over casting date was approximately March 16 or 17 of 68.
The original cracked '234' manifold was dated D108. I luckily found an excellent D118 replacement. My 68 is a 05A build with a WT engine.
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Ed
1968 GTO (Thanks Mom)
2006 Silverado
2007 Cadillac SRX
2015 Chevy Express 
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