3970010....302.....69....4...Z-28 Camaro
3970010....327.....69....2...Trucks and industrial
3970010....350...69-80...2 or 4

These casting numbers were copied from Mortec. All 3 motors have a 4" bore. I know the 67' 302 had a 2.3" main, but 68' and up had the 2.45"main. I also know it would be rare to find a 302 from a Z28 or even a 327 with this cast number since the 350 was made longer. I was just wondering if the 327 with this casting number would have the 2.3, or 2.45" main journal?  

the 010 blocks are large jrnl at 2.45  

The Block cast number 3970010 was also used in the 1968 Z-28 and is an ultra rare application. This engine block started production in early 1968 and only a few Z-28's recieved this engine in the 302ci form.