Ok, you're right about the attack capabilities. That would set it apart.
The Firefly hit that 316mph only at FTH of 16K o rso... Meanwhile the Hurr1 breaks 320 and the Sea Hurr is about 318 or so, according to the HTC speed/climb comparison charts. Their FTH is a little lower, but still not too far off.
I can see a use for the Firefly, sure... But I'll stick with my 2 cents about it having a more interesting post-war career than a war-time one. It was a minor player. The FAA lacked a lot of native designs and relied upon imports to get most of its naval aviation done. We pretty much have that covered with FAA skins for F4Us and F6Fs (and F4Fs, too).