Advice on Cylinder Head cfm for 340 stroker

Too much for what?
And that was sort of the question to you, sorry if it was to vague. But, Oh! I don’t know, 408 - 436 - small block drag car low street useage?

Dialing it back some, I have found the as cast Edelbrock head very good on a mild engine. Ported does well on bopped up mills and mild strokers, not that you couldnt race with them.....