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It's been a while since I messed with the 289s, but IIRC it should have "289 HP" or "289 HIPERF" or something like that cast into the heads. I could be wrong. Also look for screw in rocker studs. As for the block, I can't remember.
 

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Block will have Heavier Caps, Motor will have a soild lifter cam, Exhaust manifolds will be streamlined............... Check the casting #s
 

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one of the easiest ways is to look for an additional "bob" weight by the harmonic balancer or you can pull a valve cover. the hipo blocks are the exact same as any other 289, but the heads have a cup for the valve springs.
 
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