How to remove the fuse block

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I'm trying to pull the harness out of a parts vehicle(84 Pickup), got everything loosened but I can't see/figure out how to pull the fuse box off of the firewall. I know there were only two bolts holding it on, and its loose enough to move 1/2" or so in or out. But trying to pull it into the cab the engine side of the box is larger than the opening, and vice versa for the inside. I'm just not seeing how to seperate the two pieces. Anyone got any advice? Thanks.