In the books I've read, weber's often have horsepower limitations do to airflow restriction (they can have more total area under the curves though). A 48mm weber flows around 330cfm and so I estimated that 44mm webers flow 300cfm, and if there are 8 stacks, that is 2400 total cfm. I had the cam number off by one digit above...it is 361581. Here is the picture with individual runner 44m webers. I left the picture big so it is easier to read...just click the link to see it.
HP 465 @ 7000
TQ 430 @ 5000
http://www.cobralads.com/dyno2000/347_4.gif
Like members mentioned above, it would be best to call and talk to Comp, Crane, Isky, Lunati, or your favorite cam maker's tech support for this type of swap. It is on the radical side and I am not sure what the streetability level would be.
hope this helps
Andy