[pushkins]

Nope, sorry that won't work, (well....you could put it up) BUT moisture doesn't have to be seen to be present, it will and I can assure you it WILL travel down the tapcon onto the drywall. Drywall will act like a huge big sponge and what is worse is that it will allow moisture into the drywall that is not near the tapcons, sheet after sheet after sheet.

You may have dry walls now but I can assure you in older homes water proofing wasn't a code issue and even though you have no moisture issues now, perhaps it is the paint acting as a sealer (drylock etc...) now your going to drill holes in the blocks for tapcons.....?

Plus Tapcons are great I use them a lot BUT never with drywall, for a tapcon to seat in firmly it needs to bind two objects together, you will never get enough tension in drywall and hence a loose tapcon.

Still don't see why you don't use 3/4" furring strips (pressure treated) with 1/4" drywall.....problem solved.