Clearance with dry vs wet clutches

I've got a 727 that creeps in neutral to the point it will actually move the car. Yes the shifter is adjusted correctly.

Right now the trans is apart and I find the clearance on both the front and rear clutch packs are .020 to .030 too tight based on the spec provided by the VBA builder.

The book I refer to describes checking the clearance with dry frictions and steels. I didn't see any mention of that in the FSM. These parts are not dry and they don't need replaced so buying dry frictions just to use for checking doesn't make any sense. Is there a measurable difference between checking clutch clearance with dry vs wet clutches?