Tim and others,
Given the specs in the 1929 - 1954 Chevrolet MASTER PARTS and ACCESSORIES CATALOG, its an 1/8" difference in length (40 3/4" vs. 40 7/8"). Provided that the correct link is used to connect to the Huck parking brake lever these cables should work. In fact, the 34-3806 cable measures 41" according to the vendor.
Any other thoughts or ideas out there?