I just finished installing my 77 bumper yesterday. If it is like your 76 there should have been formed sheet metal stiffeners with 10-24 screws sticking out of them at each hole location. The stiffeners apply more even pressure between the screws and help keep the lines at the joint straighter and tighter. I started in the center and worked the fitment out to each end one section at a time. I have my headlight buckets out, so access is easier... it's worth the time to drop them if they're in place on your car! My fit is not exact either but I did get it OK in about an hour's worth of playing around. If you no longer have the OE stiffeners I would invest in a set for sure.
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