Answer: Your best shot at publication with that company. Remember that Writers’ Guidelines are not just a preference. Editors are looking for something specific and to be considered for their publication, it is in your best interest to follow the guidelines to the letter.
When I submitted my work, I created checklists based on the Writers’ Guidelines. After my manuscript had been through the critique group a few times, I ran down the checklist and marked off each requirement.
Not every manuscript ended up as an acceptance, but it certainly made sure it was considered and not tossed on a technicality.
So remember, one key to publication is following those guidelines.