The event is not cancelable.

The event does not have a result.

It might be required for you to import the package if you encounter any issues (like casting an Array), so better be safe than sorry and add the import at the very top of the file.

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import crafttweaker.api.event.block.MCBlockEvent;

MCBlockEvent extends MCEvent. That means all methods available in MCEvent are also available in MCBlockEvent

Return Type: MCBlockState

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MCBlockEvent.getBlockState() as MCBlockState
myMCBlockEvent.getBlockState();

Return Type: BlockPos

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MCBlockEvent.getPos() as BlockPos
myMCBlockEvent.getPos();

Return Type: MCWorld

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MCBlockEvent.getWorld() as MCWorld
myMCBlockEvent.getWorld();