5.7 HEMI Vs. 408 Stroker

jacksdodges said
Iam running a 340 stroker with a 6pk and love it. runs great and the gas milage i can live with.

I'm planning a 408 stroker. Are you using outboard carbs for a 340 or 440? I read that you should use the 440 carbs on a stroker since they were originally spec'd for an engine with a similar displacement, but I already have a set of the 340 carbs.