According to the FIAT on-line parts lookup the Super A and Super C engines take the same connecting rod, 30926DFXA. It may be possible that one of the engines had different connecting rods swapped in at some time in the past, or has a replacement engine.
If you read closely, the O.P. is talking about extra metal ABOVE the connecting rod. I take it to mean one rod has an extra metal protrusion similar to the rod in this photo:
If that is the case, and the center-to-center length between the bores is the same, the rod will works just fine in his low speed engine, or the extra metal could be ground off.
Previously, I advised him to take the rods to an automotive machine shop and have the center-to-center length checked,to do a quality repair the rods need to be checked anyway.
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