First thing, the numbers on the box are not the weight in grains. Those numbers are the stiffness of the arrows, how much they deflect (or flex) when suspending a 2-pound weight in the middle of the shaft.

First box is 300 deflection, which means it flexes .300" and is the stiffest of the lot. Equivalent to a 2512 XX78.

Second box, 340, flexes .340" and is medium, equivalent to a 2315.

Third box flexes .400" and is the weakest of the lot, equal to a 2117.

Deflection for your 2314's is .390", just a tad stiffer than the 400's. You'd be okay to go with the 400's. 3-49 ACC's are an exact match for your 2314's at .390" deflection.

To get an approximate arrow weight, go to www.bowjacksion.com and use his arrow weight calculator. He's got lots of nifty tools for building hypothetical arrows on his site.