[_Ogre]

like dsraven says, check all the body mounts. you really ought to change them all. with a gap like that, chances are the front fenders will fit similar to the inner fenders. make sure the core support mount is assembled correctly. either your core support is too high or the back of the cab is, possibly both. i've included the diagram for the core support, everything is available as a kit with bolts, washers, rubber washers and spacer, the spacer allows the bolt to tighten and still allow the core support movement.

2nd pic shows the 58-59 assembles differently than previous years; cab, core support, then inner fenders. makes it easier to build imo

remember that both L brackets bolt on the same direction, not left and right. last pic we put the front clip on to cut out for the mustII, the L bracket is exposed on the pass side, you only see the washer on the drivers side. last two pics show both brackets