Scrap dealer finds Apollo-era NASA computers in dead engineer’s basement

In the best case, the tapes would be cleaned (very time consuming) and then read on a 'newer' 7-track tape drive (although not many of these have been manufactured for decades, the 9-track format having taken over in the '60s). A more likely case is that the tapes will also require some splicing to remove irrecoverably damaged sections that cause the drives to track poorly, and probably all transfer to new reels in the process of hand-cleaning. Then the data format on them is probably unknown. It's possible, although far from guaranteed, that there will be a COBOL-type format header, but even that can be very difficult to work from. This is particularly difficult since when you miss words due to tape damage it may not be clear how many words you missed (if the drive can't track at all), and the drive may not be helpful in exposing that this happened either.

At the end of this whole process, it's likely that the tapes contain the output of a test regime or model that isn't even parsable without the original software, which could possibly be on one of the tapes but given the era and machine (probably a CDC160 based on the CDC163 pictured) is just as likely to have been on punched paper tape which would definitely not have survived this many years. We're talking a series of unitless numbers, probably from a matrix of unknown dimensions (but possibly just a series!). It would be pure speculation what they even mean.

If the data is in BCD format (possible for this machine, particularly if any non-integer values were to be stored), then it is likely in fixed-width fields and it will not even be apparent where one number begins and another ends (depending on the data, this may be inferred by padding, but the location of the decimal point would remain hard to determine).

In historical preservation, you have to choose your battles.