Opinions on my 340/Barracuda Combo!

Thats a good sounding set up you have. The only thing I would change to try for 12's is that 3.55 gears. Those gears are great for the street thou but for the best ET. 4.10, maybe 4.56 gears would be best.

With gasoline so $$$ I would just stick with the 3.55 and not worry about going in the 12"s.