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You need not change the code in anyway. E2PROM User Module calculates the flash address from the first block parameter. The E2PROM read and write routines take only an offset, which can range from 0 to Length - 1. If the First Block is placed at 62, the flash address will be (62*127 + Offset passed to read or write functions). So the code written already will not change.
You can keep the Length parameter as is.
There is nothing wrong if you leave the E2PROM placed in the center of memory. In case your program gets larger and larger, eventually it will occupy the E2PROM flash area. Right now there is no danger of this happening, since ROM utilization is only 31%. You will have to be cautious when it comes near about 49% (63/128*100).