why not just use the wooden blocks or metal spacers to space the '54 bed up the extra 2" of clearance you need
I've seen a '54 bed on an earlier frame. It does not look right, and filler plates have to be made to fit between the running boards and bed. Also the fenders need to be lowered or will appear too high.
Best plan is to find a '54 or '55 1st frame. My buddy got one this afternoon for just $75.
