Although not Huffy or Murray I do have a bone stock 1976 Garton Fox "Fox Chopper" for sale.
Garton Fox USA Built in Wisconsin. Garton Fox Corporation 1976 Fox Chopper in original condition. Garton Fox Corporation, now defunct was located in Jamesville and Milwaukee Wisconsin. The Moto Cross line of MX style bikes were manufactured in Milwaukee Wisconsin. After searching for this exact bike, and was unable to find it, "I only found one other". I was stumped buy the differing full length chain guard, Murray style chain ring, and fork between the Silver Fox and Free Spirit Moto Cross bikes also built by Garton Fox, I thought I had a Franken bike. But after looking at the 1975 Montgomery Ward Silver Fox, and the 1977 Sears 1975 Free Spirit Moto Cross bikes and noticing the differences; it drove me crazy. Feeling I had an original equipment bike, and not a spray can painted frankinbike, I searched and searched until I stumbled on a web site (oldminibikes.com) where a member posted a pic of the exact same bike as mine but with a little more for wear on it. His frame still has the center number plate tab on the seat tube. The poster stated it was a 76 Fox Chopper and that he still had the brochure for it. They came all black. Ill put a pic of his as the last two pictures of his very rare, now known 76 Fox Chopper with a chain guard and different chain wheel. Turns out it is a 1976 Fox Chopper offering. During this Fox search, I found about 8 different styles and differing brandings of this general moto cross style bike, the others were export models built by Garton Fox for other company branding. I also found out that Garton Fox manufactured the long fork muscle bikes (late 70's-mid 80's) sold in department stores as well. One other thing I found out is that; not all frames have a factory serial number on them. The picture of the manual is for a Silver Fox and is only for reference of manufacture name and plant location.
The bike is 48 pounds, not repainted and all original. 500.00 plus shipping or you arrange pick up and shipping. Try to find another exactly like this original one.