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The running board should have about a one inch space between its forward end and the front fender. That space is filled with a rubber (donut) spacer and one bolt through both flanges.
However, there is so much slop in the mounting attachments of the RB and fenders, that you could wind up with no gap.
Thanks for the info. I didn't know about a rubber spacer. When I get to that point on my 53 I will add a piece in to make up the gap. The 56 will have to wait, one truck in pieces is overwhelming enough.