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In most cases you will see either a "2" or a "4" cast in the corner of the head. On my drivers side head, I can see it located in the rear corner, towards the intake manifold.
 

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Depends on the motor. For the 351W, there isn't a difference. The 351C has a 2 or 4 cast into the heads. Except for that one odd 302(in 68?), all 289/302 2V and 4V heads are the same. Don't know about the big blocks.
 
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