Nick- I think that would depend on a number of factors. What is the vehicle and vehicle weight? What rear gears? What trans? How is your 400 built...compression ratio?...heads ported?...exhaust?...cam?...intake? etc etc. If you are running the Pontiac 4bbl cast iron intake (which is a very good intake manifold), it is a good idea to run a spread bore carb. Are the holleys spreadbore or square bore. If they are square bore and you have the factory intake you will need an adapter plate. I personally, would recommend a Qjet. Qjets are cheap, plentiful, and there is tons of advice on these forurms for how to tweak them for best performance. This is not to say the Holley is not a good carb, I just prefer Qjets.
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