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I went with the TSP hardened pushrods that came with the cam package for my MS3.They are 7.400 and they really didnt give me the sewing machine effect like i was expecting.
I would still go with the 7.425 if you havent purchased them yet. Im milled .040 with 7.400 pushrods, so thats like running 7.440 pushrods on stock heads. Im happy with my valvetrain. Much quieter than it the 7.4's were on stock heads.
I beleoive i read somewhere the kits came with 7.400 cause the 7.425 was on a huge backorder or something. It was another thread asking basiclaly this eact same Q about a week or two ago.