I have a basement that was finished with wood paneling.  I am removing it and replacing with drywall.  Upon removing the paneling I found 2×2 studs fastened directly to the block wall with a layer of 4mil poly between the studs and the block.  There is zero signs of moisture and the studs are in great shape despite being in place since the 80’s.  I know this isn’t the most efficient way to do it but what I’m considering doing is removing the poly vapor barrier and placing 1.5” R-tech rigid foam board in between the studs and caulking the edges.  This would leave a .25” air gap between the insulation board and drywall.  What I want to know is am I setting my self up for a moisture nightmare understanding that this is not the most efficient way to do things but it would put me in a better situation than my current one (non insulated).  I appreciate any and all input!