Never attempted it in that way.......but I believe the wheelhouse assembly and the structure above it will interfere.

FWIW, on my '69 GTX I was able to slip the 1 piece trunk floor in with one quarter off but I also had the wheelhouse assy removed at the same time.
Trunk gutters were left in place/intact, but all the spot welds at the rear crossmember were all removed which allowed some movement to get it all installed.