I have done something similar but only when the block is "titch" small. No problems later on. Some times a quick spray of water or spray starch them press, and it will make the block the correct size. Trying to gain a 1/4 inch or heavens more, I would return to the block and resew some of the seems to the scant 1/4 in in a couple of seems and then the total block will be the correct size.