Yes a stroker combination is worth it. At your level you could use the cast steel crankshaft thats under 400 dollars. And yes these cast cranks are plenty strong for that level. So you get 416 cubes out of a 340 for only about 200 bucks more than you would normally pay. Plus lighter rotating assembly.
I would use some edelbrock heads at your level, or score some used w2 heads for when you want to turn it up a little more.