toe in ..... is the big mystery
simple realy though, firstly make sure you nip the block up good and tight when you've got the following sorted ...... set the back of the block off the the rim when the brake is applied it will stop the squeek, try a mill or 2 first.
if the blocks are the new soft squashy ones you'll kneed quite a bit of gap, the blocks will probably look odd stuck out to far , but with the new soft blocks the toe in is lost because the blocks compress when the brake is applied , grab the brake as if your trying to stop dead rather than just slowing down if there is still a a gap at the back of the block you should be ok. if not try increasing the gap till the squeek stops ,you can also sand down the back edge of the block
You might want to look at the Odyssey Ghost blocks they have the toe in shaped in the block (although it's just not quite big enough....
) you don't kneed a block the size of the current ones for em to work properly if you set em up right .