Full floor pan install

do you need a factory frame sheet to measure it out? If your swinger is a 70-71 I can scan one and send it to you...
If the car sagged in the past someone might have adjusted the doors to fit although that would leave gaps that were uneven somewhere (narrow to wide), right?
It's definitely got some funny gaps but not necessarily to wide I don't think. Mines a 73. The drivers side door striker panel is booger welded too. I ordered that panel already. I'll look and see if I can notice any oddly shaped door gaps tomorrow after work.