Thanks the horn cover comes off by prying with a screwdriver I found out

According to the 56 Manual(the 55 horns are similar) there is an adjustment that can be made by loosening the locknut and turning the adjuster In the centre of the horn from outside..You might try that.There is a set of points inside.Possibly the points are corroded.I don't know if the horn can be opened up or not.Are there screws or bolts around the edge that could be holding it together or is it rivetted?

  

I got one of the horns to work correctly is there a way to take the horns apart to clean inside them? The other one tries to work and all the grounds are clean as well as the hot terminal.

I bought these square clips to holt the trim on but they are tough to put in. You have to put them in the holes in the body and bend them over to hold them in. is there any easier clips to get for the body trim thanks.

It is too far in to reach to put the clips on the customline by the air intake tube. I finally got the bolts out and removed part of the inner fender and put the clips on.

You may have to loosen or remove the lock support piece that runs across the front from fender to fender.Thats what i understand the procedure to be on my 56 looking in the shop manual.As far as the Customline N/Plate removal-can you not reach down under the air intake tube to reach the nameplate retainer nuts?

  

You can not reach under the fender there is a inner piece which prevents dirt from hitting the top of the fender and it blocks from reaching up there.

You may have to remove the grille to get the horns out.The Customine Emblems should be accessible from under the car rather than through the engine compartment.

  

I will try that and also how do I get the customline emblem on the right front fender. the heater duck is in the way

Can you loosen the radiator and ease it out of the way?