I have a 950 HP that I run on my 427w that runs great. I did have to make the modifications to the metering blocks with different power valve restrictor size, idle feed restrictor size, and change the throttle plates (w/o holes).

I also tuned an 830 HP for the engine, but the 950 HP actually drove better on the street and made more HP and TQ. If you're willing to put in the work to fine tune it, I think the bigger carb is the better way to go. But it did take me drilling and tapping the metering blocks and making my own restrictors with set screws.