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What year(s) for the 235 and 261. Through 1957, there were no difference in replacement pans.
I have also see tdifferebnt baffle arrangement in 1959 261 pan compared to a 1960 261 pan.
I do not know why your pans might be different, but I would use the 235 pan and just keep a close eye on the oil pressure gauge for the first few hundred miles over different driving terrains and speeds.
Tim
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