I don't run stroker engines. I'm already faster than I need to be, and I'm running a 273. The stock internals are fine and you already have them. I'm sure some one will chime in on stroker kits.
My son has a 73 Dart with a stock 318. We added a small Mopar Performance cam, dual exhaust, 4 barrel intake, Edelbrock 500cfm carb, and a 340 distributor. It runs very nice for what it is.