Glad you are using it! I think the following should work:
blahMethod: withArg SpecialBlock: myBlock = ( .... myBlock value: 10 With: 20. ).
I want to call it with:
blahMethod: myArg SpecialBlock: [ | :firstArg. :secondArg | " do neat things with the arguments " ].
Note value:With: instead of value:Value: and also note the period after ":firstArg".
I am doing this from memory, so I hope I have got right.