I did a little bit of web surfing on your question. Found some pictures that I screenshot and added below to show what I found. The pictures for the 1955.2 NAPCO 3100 show the decal on the glove box door and emblem on the lower rear section of the front fenders. The 1959 NAPCO 3100 pics show the decal on the dash above and a little left of the glove box door as there are a couple of riveted plates showing the NAPCO Power Pack transfer case instructions and operation warning. Fender badges are again on lower rear section of front fenders. None of these are mine, nor can I vouch for the placement accuracy. Just trying to provide a little info on your question. Perhaps some of our NAPCO Stovebolt owners can pipe in with their knowledge and expertise???
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~ Dan
1951 Chevy 3 window 3100
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"My Grandpa Carl's Truck and How it Became Mine"
1966 Chevelle (Wife's Hot Rod) | 2013 Chevy Silverado (Current daily driver)
US Army MSG Retired (1977-1998) | Com Fac Maint Lead Tech Retired (1998-2021)