No, it wasn't.
I know exactly where you got that, because it is on the VHSL website for baseball. And it is WRONG. Did you miss the part about I was THERE. I'm not making this up to try and show up the poster that said Amherst beat WA in '78. How else would I remember Ken Dixon, think about it.
I can't remember who else played for Amherst but some of Warren County's best players at that time were Garnett Henry, (the late) Dale Henry, Jeff Bowers, John Ramey, Robert Nickens, Barry Jenkins, Mike Corbin. I could go on.
For Amherst reference, seek the supreme Lancer source of wikki.