Believe DONT DO THIS MOD! Why? Sure it generate boost faster, but the main problem is when you do so, the current fuel injectors can not handle the influx so well and will produce more KR than the "mod" is worth. I did it on my old SC before I did my swap with one of Brian's ported and polished SC's.
But IF you are stuck on wanting to do this mod, I would mark EXACTLY where it was before you move it. Cause if you don't, its a buggar to get back into the factory set position.
And going in reserve of the mod won't help either. If you are getting 5* of KR now? You can expect a lot more afterwards with this "mod." So choose wisely which direction you want to take. I personally would hunt down your current problem with KR than moving the BBV.
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