might be too late to help you on the trunk floor, but I'm just finishing up mine. Buying it in pieces cost a lot more in time and money because you also have to buy all the braces, and there are 5 of them, L/R floor braces, L/R tank mounts and the front cross brace that goes between the wheel wells. The complete floor comes with all the braces already installed. They don't make a complete trunk floor for a Monte, you have to use a chevelle piece. What I did was buy the chevelle floor, which goes from the top of the under rear seat floor all the way to the base of the tail light panel. The problem is that where the rear of the floor kicks up tp meet the tail light panel the shape is different....all A body floors are the same until you get to that area, they are all different because of the different shape of the tail light panels. I bought the part that goes from the bottom of the trunk Floor up to the tail light panel from a parts yard out west. they sold me that part and the rear floor brace for $175 shipped. Took the body off the frame, blocked it up, cut out the main sections of the floor and then spent a lot of time drilling out spot welds. I got a GoodMark piece and it fit very well...It's a big job but not complicated, I had never done one before, did it by myself and it came out very good.