75 Dart Swinger

Yesterday I got to sandblasting all the areas I wanted to and primed them all. Have done a few test fits with the floor and it doesn't really sit as close to the lip on the firewall as I would like, its probably around a 1/4 to 1/2 in gap along the hole thing and it doesnt really feel like we can push it any further, any suggestions?

The hole in the wheel tub is where the rear seatbelt was attached to... Broke it off by wiggling it once. Whoops

The last picture is my dad's very convenient well equipped 54x80 shop that he lets me work on my car in!

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