So I had a flash of inspiration the other day.
I unscrewed the firewall from the passenger side of the floor pan and used some ratchet straps to first pull the floorpan downward, then and used another 2 straps to get it positioned to where it looked right and level. I am happy to report that it is positioned really well now! I also fitted up the rear quarters, extensions and tail light panel. There are still gaps here and there but I think so far I have been really lucky with panel fitment. It would appear that aftermarket panels do fit well to each other. I have to take pics, but I also was able to fit the piece that goes between the back glass and the trunk. I used the original 69' for measurements and got it really spot on. Will post pics of that later.