Even with a 6700 rpm redline, the formula with 0.9 VE says 612 cfm. I'd go with a 600 cfm, throttle response and drivability is better and far outweighs the split seconds of 6500+ rpm where you could use more carb.
I assumed 351 CUI...
PANTERA INTERNATIONAL
A DE TOMASO CAR CLUB
Presents the De Tomaso Forums
The On-Line Meeting Place for De Tomaso Owners and Enthusiasts From Around the World
Clicking on the banner will take you to the sponsor's website.