[dsraven]

welcome. good to see another Canadian on here.
your truck looks like it's in really good shape. do you have a good box as well?
when you say you are using a yukon to get a napco clone, do you mean you are doing a frame swap or are you swapping in suspension parts from a yukon under your original frame. will you also swap in the yukon engine, trans, transfer case?
have you downloaded the factory assembly manual? it will likely be really handy for you. frame dimensions etc. it's a free download from the trifive site. google 55-59 chevrolet truck factory assembly manual and click on the trifive site. I suggest you keep a copy on a thumbdrive