12 second 340

Ok my car is starting to look like a full on drag car. I really need to update the 340. Id like to get it in to the mid 12s.

Can anyone recomend a good combo for me? Lets assume the 340 is currantly stock with nothing other then an LD340 intake and headers. Im running a 727 and an 8-3/5 with 3.23 gears right now. Tires are 28" tall. Street manners are not very important.