I chose C&C because I'd like to convert old O&AD&D from my youth easily. I've read explanations on how to convert AC, HD and saving throws, and it seemed indeed really easy.
However I have some questions.
Magic items gained in the old modules are very powerful. Way too powerful according to Monsters & Treasures. But I would like to play these modules as intended! So here, my first question: will I encounter problems if I keep those magic items, and the original economy, and the original tables for treasures in the long run, within a campaign?
I read that 19-AC (20 for AD&D2) was the way to convert armor class. However, in Monsters & Treasures, 21-AC seems to be used! That's a big difference! Will I encounter problems if I choose to use the original monsters from the modules, with the 19-AC equation? (And with the already too powerful magic items.)
My purpose with C&C was to play with a simple ruleset all my old modules without too much hassle. But if I have to rethink every magic item, every treasure, every monster, every NPC, etc...
So, have you already tried playing old modules/campaigns this way? Any advice? By the way, B11-B12-B10-X1-…, staying within the realm of OD&D, at least at first, is my first idea of a campaign (for new players, but not sure yet).
I'd really love to love C&C.

Sorry for my bad english and thanks in advance.