How street able are these 340 stroker motors?

The gears,@ converter ,and desired results paramount here. Do you want brutal torque,with stock exhaust manifolds? A 408/416,will deliver. The W/2 setup,kind of throws it out of whack. A set of worked X's ,J's,or Eddy's apply here.I would seriously look at a split pattern cam,possible 12-14 degree split.: