340,to stroke or not to stroke

I havn't fooled with small blocks in many years, I bought a 69 dart with a mild built 360, but it just doesn't have the oysters that I would like. So my question being is. Do i build a 340 4"stroker? Maybe a 402 crate motor? My objective is to be able to drive it easily on the street to car shows and swap meets and the like but still have an eye opener when you firewall the gas pedal. I'm sure some of the members here have an opinion on which way to I should go. It will be an automatic with a 3.55 sg. Any help? Thanks---Roy