Was there ever a factoty rad shroud for a 1964 jetstar. I just purchased a plastic one off a chevy truck from a local swap meet and retro fitted it. If there were a factory shroud i would prefer to use that.

 

Factory A/C and special cooling cars had them. Can come off any 63-64 full-size car, 88/98/Starfire/J1. P/N 587190.

If the Chevy truck piece fits and covers the radiator core, it might work better than the original- which is basically just a metal venturi ring around the fan.