I would consider them a waste of money on the street... A 416 Stroker is going to ignite street tires with stock heads... And a mild Cam and pretty much any gearing...
I can back this statement up first-hand. My 340-based 416 with mildly hand-ported J-heads and about 10.25 compression made right around 520 HP/535TQ on the dyno with a 750 carb that wasn't tuned as good as it could have been. I'm running 3.73 gears and she's a blast to drive!