Part 2:
Another issue common to both Holleys and Quadrajets are stripped fuel inlets. Holleys have the distinct advantage that repair is often as simple as replacing the float bowl. Unfortunately for QJets, it's a little more involved than that.
The fuel inlet boss on many QJets doesn't have much meat around it, which makes installing a thread insert an iffy proposition. When looking over a QJet for purchase, take the time to examine the fuel inlet threads to make sure they're not stripped, or on the verge of going as is the case here:
