It looks like someone has assembled 346 worm gear, reason why there is too much side to side play. There is significant difference in them, see picture below. 357 worm gear has small shoulder against crankshaft. I discovered this when I was building my first 357.
You need new metal clamp and intake boot, new small spline clutch and .325 7 pin sprocket and worm gear.
Part numbers not in particular order
503912703
503980002
501457402
537438801
503928702
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