I'd pick up a second spool. When I made my niece's quilt with a 3/4" meander for the center section (42x51), I used around 500m of thread with some un-sewing. So, if you plan to use the same thread top & bottom, I'd probably allow at least 225-250yd of thread. It might be less since I went around appliqué (not outlining because I didn't know better, but it was more thread breaks), but unless you have a different bobbin thread, I don't think 164yd will be enough for that density.