new purchase LD 340

Walt. Is that a typo or did he say 700 cfm?

Edelbrock makes a 600 and a 750.

You can wittle down the boosters for increased flow and mill the air horn for more. I wouldn't bother on the latter for the street.
If you feel adventurous, you can allways try the NASCAR modded secondary work Carter did years back. Excellent at W.O.T. only. He he he.