Just to follow-up. The 157 tooth flexplate has the same imbalance and will work with the 351W as long as the converter, bellhousing and engine plate match up. I had trouble with the engine plate. It was hard to find one I think because they haven't used the 157 tooth set up since ?73. The plate for the larger flexplate is almost the same except the starter hole is about 1/2" different. Murray
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