Carburator

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When I restored my 63 T-Bird a few years ago, I installed a Holley 600cfm with electric choke. Worked great. But the machine shop that rebuilt the motor recommended that I replace it with a Holley 750CFM electric choke. It had more power a better throttle response. Just hook up your electric choke to a switched wire with an in-line fuse. Good luck!
 
Go with the 750 and you won't regret it. More is always better
 
Hi. I have a Holley street avenger 670 with an electric choke on my 63' 390 with a healthy cam. My engine builder recommended this size. As too big a carb can sometimes be too much.
The street avenger is very responsive. It just needed to have larger jets installed during a dyno tune as it was running a bit lean on fuel.
Probably best to talk to a carburettor specialist that has done these engines before.
 
I am old school and I build my own engines and I had a 67 fairlane and I put the 750 on my engine and it was not too much. As you said you had to rejet due to too small of jets. Did you then check to see what your air fuel ratio was or just run it. Just saying. I am in the process of building a 283 and I am building my own intake manifold to use 4 1956 2 barrel carbs and each venturi will furnish fuel to one cylinder. The carbs will be sideways over the ports and will be like direct port injection. Each barrel will have to be adjusted for idle. This engine will be in a 1956 Corvette that I have. I also have a 1955 tbird with a 312 with 2 four barrel carbs that I am working on. I am debating on pulling the engine and installing a 1967 390 as I like those engines. I do have a need for speeed and power. It is a weakness that I have had since I was very young. I also ride a 2000 Honda Valkyrie that I installed a M45 blower on and it is a blast to ride. Hope you have good luck with your carb change. Either way you go will be okay.
 
Hi Dave. Yes the air fuel ratio was checked. Also at speed and under load on the dyno. As it was done by a well experienced and trusted carburettor specialist.
 
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