The 62-65 engine is mounted further forward. I'm assuming #7 and #8 tubes go thru the fender well with slip on collectors.. I run what I believe is the same header. Hooker 5320. We've run 4 sets of these on 3 different cars. Two of the cars had the motor moved back close to the 66-70 location. The right side has always fit. The left side depends on how far back the engine is. One set the #7 tube had to be raised to go over the steering shaft. Two sets fit perfect. One set the #1 tube was modified slightly.
Doug