Crank breakers wanted

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Got the front clip off and a head pulled today. It is a ‘74 block with 974 heads. What makes those heads good?

The piston sure wasn’t havin a good time. The bore looked and feels untouched.
If you elect not to hold onto that block, you should be able to sale it pretty easily. Many have found those early 360s show very thick cylinder walls on the major thrust side during sonic testing.