Quilting Chris

I'm currently quilting a small challenge quilt for our local guild show. I'm doing matchstick quilting. Because all the quilting is vertical it has mainly shortened the width. The matchstick quilting results in a quilt that has a degree of horizontal stretch in it. I plan to block the quilt at some point before entering the show. Should I sew on the binding and then block or do it in the other order? I'm afraid if I wait to do the blocking after putting on the binding I'll have a wavy binding because I might stretch some parts of the edge at a different rate than other areas of the edge while applying the binding.

Anyone else have some experience they can relate to me? Maybe block before And after binding?

Thanks in advance.