When is a 904 too small?

Well yeah a 450hp 340 with crazy compression, has the ability to explode that 7.25 at a moments notice..... if you choose to. But the operator is in charge of that, right.
It sounds like that 340 is fully optimized and detuning it is likely gonna cost some coin. Three or Four cam sizes is well beyond a gasket swap.

Gears are the 2.73s friend