A 1964 Ford F-100 left Dearborn as a work truck for farmers and tradesmen. This one has a chopped roof, a hole cut through the hood, and a flame job loud enough to be heard from the next aisle over. What makes 1964 the right year to start with is a construction change Ford made that year, one most builders never think about. Read on for what Ford changed and why it matters to anyone cutting one up.