I would do as mentioned above by Doug. Drop them down to .036 or so. Worst case scenario is the idle will be a little rough occasionally, but the chance of spark blowout is greatly reduced.
The motor likes a wider gap. But with the boost pressure going up significantly with the smaller pulley, the chances of a misfire are greater. The spark can't jump the standard gap under the increased pressure.
At idle, the narrower gap does not produce a spark of sufficient intensity occasionally to ignite the leaner fuel mix.
It is not something that is really obvious, especially in systems that use
multi-spark, which I believe these cars do, but it is still there.
And the occasional misfire at idle is more than a fair trade off for no spark blow out on the top end.