Welcome to the forum
That does look like a nice solid truck. I agree that your heater controls look like '55-'59 truck or maybe '55-'57 passenger car? Definitely not original. You need the heater controls for a '64-'66 with the deluxe heater.
There is nothing wrong with where and how the engine is mounted. The motor mounts and where it is located is exactly how the factory installed the V8's and the 230/250 I6's. In the '60-'66's the I6's and the V8's installed in the same location. That radiator and fan shroud of sorts is not an original '63-'66 truck radiator and shroud. If you get and original style radiator and V8 shroud, the fan will sit partially into the shroud as it should.