Koffels offer B1's CNC ported (by another business), they are spendy though. The Chapman head pictures make the CNC porting look real good, I would be surprised if the Indy CNC port jobs are as nice, but I can't say for sure.

Last I knew, the basic B1 package was about $3300 during the winter sale. The smaller (than B1 or 440-1) 285cc port Chapmans should be real good at making power with smaller engines or at lower rpm, so I can see why they might be the best choice for some buildups. I suppose there might be some engines that could effectively use either the B1 or Chapman, but in my opinion they are 2 different animals that fill unique areas.