SYLVANIA — With the general election more than 13 months away, Rick Allen and John Stone, vying for the Republican nomination for Congress in Georgia’s 12th Congressional District, are speaking at fish fries and jostling over debate plans.Voters will decide in the party primary May 20 which of the two will challenge U.S. Rep. John Barrow, the incumbent Democrat, in the Nov. 4, 2014, general election. The primary, for both parties, will be the earliest in memory for Georgia, after an unusually late July 31 primary in 2012.The May primary means that the Republican nominee should have 5½ months to campaign against Barrow, GOP 12th District Chairman Lawton Sack noted. That is more than twice as long as last year, when a ballot with four Republican candidates resulted in a primary runoff.“The biggest advantage is, with only two candidates, we’ll know May 21st who our candidate is,” Sack said.