The Spit 14 is equal or slower at altitudes below 20K, to the Dora, P-51, Typh, and K4. and slower than the La7 below 8K.
I've never found the 14 to turn or handle as well as the 16 or any other SPit, which is really the advantage of a Spit. If a K4 or Pony dives away from a spit XIV, the Spit can't catch them. This is due to that the spit being speed limited in a dive because of that wing balooning issue that slows the plane and forces pull out in all SPit designs. for that reaason i'ts not a better BnZ plane than the other spits already available for no perks.
The only advantage of a Spit XIV over other spits is a higher top speed. But that speed isn't high enough to run down the planes that are already faster than a SpitXVI [pony, K4, Typh, Dora] So the advantage is not a very usable advantage.
I think this is why no one drive this bird, the perks aren't worth it, even though it's only 10 perks.
I'd vote for a no perk trial run.