Clearwater cylinder head comparison to 0331/0630 ports?

[hot_rod_hooligans]

I'm working on a new top end on my XJ... cam, lifters, valves, valve springs, etc., and I've got a custom grind cam from Comp that allows me to use stock valve springs. After a lot of pricing, weighing options, I've decided to get a head from Clearwater

I'm trying to figure out what to do with the exhaust now, and am trying to find out what casting Clearwater based the exhaust port design off of, since the head was designed to be a replacement for the 7120/0630/0331 heads, but there is a bit of a difference in port design between the 0630 and 0331 heads. I called Clearwater today and apparently nobody has ever asked before. So does anyone have a direct comparison of the Clearwater head to any of the other HO heads?

[SilverXJ]

IIRC its based of the 0331 ports. If you are using a header it won't matter anyhow. If you have a pic I can verify.