Sometimes it can be helpful to make a practice block to see if a true 1/4" seam is going to work. Even if the pattern has several different blocks in it, sewing out atleast one should give you an idea if you need to use a 1/4" or scant 1/4". :D:D:D
You can always sash these practic blocks to get them to a uniform size and put them into a sampler quilt :D:D:D