Very carefully. Generally take trunk pan and tail panel out and slide in from the rear. I read a post here about a year ago that someone said they got it in through the windshield frame, but I don't know how they pulled that one off. When we did the floor of my coupe, we braced and jacked level off the floor and installed from the top. Did the full trunk pan first, then did a large, partial floor. Never raised or flipped her though. It sounds nice, but tough to support and brace.
I used to be indecisive. Now I'm not sure. I feel like I am diagonally parked in a parallel universe. 1968 400 convertible (Scarlet) 1976 T/A - 455 LE (No Burt) 1976 T/A New baby, starting full restoration. 1968 350 - 4 speed 'vert - 400 clone (the Beast!) 1968 350 convertible - Wife's car now- 400 clone (Aleutian Blue) (Blue Angel) 2008 Durango - DD 2008 GXP - New one from NH is AWESOME! 2017 Durango Citadel - Modern is nice! HEMI is amazing! 1998 Silverado Z71 - Father-daughter project 1968 400 coupe - R/A clone (Blue Pearl) (sold) 1967 326 convertible - Sold 1980 T/A SE Bandit - Sold