I will second that,, Most of those Golf Car GC-2's are 220+/-10 with Sams and Costco being -10 so his estimate is perfect.
Just so you know, Most all batteries EXCEPT OPTIMA of the same size are xx+/-10%
Group 25 75 AH
Group 27 and 29 just under and over 100
Group 31 130
and GC-2 220, (NOTE you need two GC-2's and you wire in series you add VOLTAGE not AH)
You have a very nice set of batteries there. Exactly what I would recommend.