Nice looking engine, Fletch. Is that a Hipo exhaust manifold or an early 351 manifold on it? The vertical bars on the ends of the heads identify them as GT40 pieces. Stock Explorer manifolds seem like they might clear the shock towers of the early Fairlane, have you ever tried that? I have a 351W in my '64 with headers that I modified to fit years ago, but am not looking forward to making another set when these get rusted out. I weld patches in every couple years now which is a bit of a hassle.
Your upper radiator hose looks a little stretched, this might be hard on the radiator.