I assume that you already have the compression at a blower friendly level & want to run pump gas. Detonation is going to be your biggest enemy with a blower & keeping the air charge as cool as possible will help avoid detonation. The 8-71 will make about the same boost 10% underdriven as the 6-71 will running straight up on a 454... so, less heat. Lots of folks like the Edelbrock carbs, but the Holley or Demon carbs are (IMO) are best suited for blowers. Other things that help keep the heat down would be aluminum heads, running straight water (no anti-freeze) BIG aluminum radiator & dual electric fans, high flow mechanical water pump, engine oil cooler & keeping the timing advance down. There are several other members here that have quite a bit of blower experience, perhaps they will have a few other suggestions.