I'd like to know what size/year an oil pan with the stamping "971" was used on. I have 1973 & 1974 parts books that indicate 400/440 R and W carlines had an 3614970 P/N oil pan, which is the application I'm looking at. I didn't find any 3614971 within either of those parts books or any number in the oil pan section that ended in "971".

Please help.