Is this VIN a 68 340S?

Yes the 5th digit in the Vi. should be P.The 340 in 68 was only in the Formula S Models.And was notoffered in a standard 68 Barracuda model.The Formula S package should also be a 367 sales code.The Formula S package is 340v8 4bbl w/Dual exhaust,tachometer,HD suspension package(front sway bar,HD torsion bars,and HD leaf springs),firm ride shock absorbers,Formula S fender medallions,engine plaque,E70x14 red streak wide oval tires and 14x5.5 wide rims.
Jim