Reply to "Manifold Question - Performer vs A331 Torker"

I've just re-read your original post and noticed you are using Edelbrock heads, that hadn't registered in my mind previously.

My carb recommendation had been based upon the assumption your motor was built with 4V heads. The 2V heads throw a wrinkle into the equation. They are not the same heads as a small block Chevy or Windsor Ford, where a 600 CFM carb works well on the street. On the other hand, they work at higher velocities than the 351C with 4V heads. They kinda work in an area between those two extremes. The 750 carb will work, but I might be inclined to recommend something a little smaller, like a 700 CFM Holley.

The old 750 double pumper had a list number of 4779, it was jetted too rich for any street application. It was jetted for a big camshaft and low intake manifold vacuum. So when you used it in an application with substantially more intake manifold vacuum, the low rpm circuits flowed too much fuel. Its not smart to base the suitability of the 750 Holley on the experience of someone who bolted on a list 4779 out of the box.

HP series Holleys are not jetted anything like that. They are tuned very well out of the box. They are Holley's answer to the popularity of tuner carburetors. List #0-82751 has a street calibration (high intake manifold vacuum, leaner jetting) out of the box. Its has been used successfully by a lot of people. I'm sure it would work in your application. But if you could find a 700 CFM Holley that's been tuned by one of the carb tuning shops, that would be cool too.

Use a double pumper for best acceleration; the Pantera has a manual transmission, low gearing and light weight to justify the double pumper. I agree however that if fuel economy is important to you, a vacuum secondary would be a better choice.

-G