Those cams from web certainly are 'big'... and a very narrow lobe centre.
I think you'll be very happy with Williams cam. I've used it on 3.0 with itbs, and 3.5 with itbs and it drives like a stock car down low and revs all the way to redline.
I've even test run a 3.2SS with CIS and it actually idled 'ok'... this was only on the test stand and not driven.
Keep us posted.
