I finished the floor portion of the '70 I'm doing - all AMD parts: compelte floor, rear floors, torsion bar cross, inner rockers, and left rear frame rail. the parts fit "well". Not "perfect". You will always need to tweak and like Barrs - if you want it nice you need to know what to do to make them look really nice. but LIGHTYEARS ahead of what used to be around (cheap skins, patches, etc). The next phase (coing this fall) are both quarters, reapair of the reas window channel, and Dutchman but I was very satisfied with the AMD stuff. Yes- it takes some time and tweaking - but the results are good. The only issue I have is the gage is thick, but the steel is obviously softer and probably a certain percentage of that is recycled. So panel life may be less than a factory clean steel part and there's nothing you can do about metal impurities that are invisible.
Edit - I'll add - every car is an individual. So you may find yours is perfect, and the guys next to yours at the resto shop they have to scramble and mess with to get pretty, or vice versa.