Floor Pan Replacement - GM A-body

[Schonyenko2]

Without seeing the floor or trunk area it's hard to make an acessment of what it needs. My 2 cent advise though is if you're doing a full floor replacement it should be sitting on the frame with the frame mts in the correct location. Without that, you won't know if the pan is going to line up with the frame for sure. I think you'll want to put the bolts in as you go and pull them to torque specs too as on an A body, that can effect your gaps.
The AMK full floor is very nice, but correct placement in relation to the frame mts is a must. JMHO