Results-- The masking kit: The best results came from the use of Scotch 3M Fine Line Tape and new X-acto blades rather than the masking kit. On wheels that I used the masking kit, I had to use a lot of the fine line tape to fill the areas not covered by the mask. My overall impression of the mask is not good.
Paint: The silver paint I bought from PY was a pretty good match. The PY inner charcoal color resulted in a nice-looking wheel but for originality purposes, it was waaaaay too dark and glossy. I then bought the recommended Duplicolor as discussed in a magazine article and found it an identical dark color to the PY paint. My color comparison was between my test wheel and pictures of a POCI multiple-Gold award perfect '68 and some unrestored Rally II pictures.
I now know why the Ames catalog paint has the note: "For years controversy has circulated concerning the Rally II charcoal paints available from the vendors." and "This color is a darker charcoal than original." And, I know why PY recommends the use of a satin clearcoat to dull the glossy paint down.
Bottom line, I ended up ordering the charcoal paint color recommended at the 1st Gen site FAQs from Tower Paints. The shade and gloss level looks good compared to Concours quality wheels.
Here's a wheel with some of the hardware in place. The brushed trim rings are still back ordered.