The cam will center itself in the bearings in the block, so the oversize hole in the thrust plate won't result in any wobble. Is there some reason the correct thrust plate isn't available anymore? Some timing gears have a shoulder that fits into the hole in the thrust plate, so you might have to match up the correct gear with the plate.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
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