For a dual 4v carb application those carbs are a good choice especially given the relatively low peak rpm and 500' displacement.
This is a 5000 pound T bird guys. Its all about generating as much torque and HP under the curve as possible.
Scotty J. "AKA" The "Mad Porter"
"EMC 2006" 3rd place finisher
Ported BBF iron head specialist
& Aluminum heads from all sources.
Custom ground cams
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"ReinCarNation High Performance