Has anyone used an edelbrock thunder series carb on a BB stroker?

The 800 Edelbrock will work just fine at 550 hp. You might need to fiddle with the jetting to get it dialed in. Nice thing about the Edelbrock design is that you can do most of the fuel curve tuning with the metering rods. Sometimes you need to also increase the secondary jets but most of the time you can dial those carbs in by just changing the metering rods.