On some further research, everything I've found only appears to further cloud the issue of what 40s served the AVG or 23rd. It appears that the AVG got some E's, and the later variants were assigned to the 23rd, which still sported the AVG sharkmouth. The 23rd did have some AVG pilots who remained, but most were regular USAAF.
There is some conjecture as to just how different some of these planes were... hot rodded engines, customized (juryrigged) armament, etc., down to some later planes being repaired using parts from cannabalized B's and E's.
I think now that this may explain why some (including me)get confused as to which type was which, what with some repaired planes flying with a mixture of different gun types, B cowls fitted to N models, stuff like that.
Anyways, the original point remains... for those of us who ARE fans of the P-40 (and in my opinion, it is a sweet aircraft to fly, at least in AH), why can't HiTech model us a K - N model? I mean, just look how many 109 and 190 types we have!!