32/F/D/Z/T means a PCN of 32 based on:
Flexible (asphalt) top surface.
Very weak subgrade.
Tyre pressure category very low - limited to 73 psi
Info derived from technical evaluation.
So not suitable for a 763. On this surface 32 would give no usable payload/fuel on arrival and the tyre pressure thing alone would be a stopper. I can't answer for A300 or 762 but I'd guess that JUB wasn't built with this size ac in mind - haven't even started to look at TO/Ldg performance. Most suitable freighter would be something like a C130! All that said, I'm intrigued that you say that A300 and 767s operate there regularly.
Sorry to be the bearer of bad tidings.