400 with TF 240 heads - valley plate options?

LAST I READ WAS THE STOCK ONE HAD TO BE CUT OUT TOO FAR .
GOTTA ADMIT NOT REAL INTERESTED , MIGHT HAVE MISSED THAT---------------AND YEAH UP TO A CERTAIN POINT THEY SAID I WAS STONE DEAF, FOR SOUNDS BELOW A CERTAIN POINT .

Well I am deef, so there! lol