I usually square my blocks. In the case of your quilt, if they are fairly even (within an eighth of an inch) I would leave them, as you will have plenty of opportunities to even the edges when matching the seams. Hope that you remembered to press to the dark fabric which will make seam matching much easier. Also remember to put the block to be 'eased in' on the bottom as the feed dogs will help to take care of the excess. This quilt is going to be a 'big bargain'. I always like to put on a border, however small, to stop the 'action' of the quilt. Good Luck...it looks like you are on your way to a quilting future.