dont know about that terry
that air cleaner was used in 1970, a year before the t-quad was used in 71 on the 340 only
i know in 72 it was used on the 400, too
but even in 72 a 440 hp used a holley
in 70-1 the 383 both had holleys
and 70-1 440 HPs had avs carbs
i believe, and im sure you know for sure almighty shaker expert that you are
that the 71 340 did use a different shaker basplate then the 70 340 to allow for the t-quads height,
but maybe it wasnt as critical on the air grabber as the seal to the base was somewhat flexible??