Carb cfm with ported heads?

Knuckleduster, a note about the Nitto's. When I had my old 360 (approx. 350 fwhp) in my car with 3:73's and a 3K stall I couldn't get it out of the hole with stock radials so I put on a set of Nitto's. Like night and day. Launched real good. But as soon as I put in the 408 (approx. 475 FWHP) traction went out the window. Tried different pressure levels. Installed full Caltrac rear suspension. Still couldn't get it to hook good and I now had 3:23 gears. Installed a set of MT drag radials and it hooks much better. Their easily worth the money difference IMO. The only drawback to them is their soft so they don't last long if you drive a lot