74 Charger interior fuse box issue

[Bigsmoke74]

My 74 Charger has a loose fuse box sometimes when I turn the car over it starts but stalls when the key goes back to the Run position I checked everything and then I found that if I pull on my fuse box a little bit it will stay running in the Run position I'm having a hard time getting the fuse box out so I can find out my situation is it clips I don't see any screws what holds that fuse box to the bulkhead firewall side

 

[bee71]

Could be a ground on the inside or a wire connection at the engine firewall side.