Is my 340 stroked

What were the specs on the original cam? i am running a stock converter and 25.8" tires. Big rear tires make a difference too. You may have some tuning issues but i had difficulty cleaning up the idle with that 268 cam, with 224
and 230 duration.
Stroking a 340 to 416 will make way too much lo end torque for the street unless burnouts are your thing. Having said that, the hobby is different for everybody.
I like lots of lo and midrange power, quiet exhaust, smooth idle and 20mpg. There, i said it!