Hank,
I will probably test divided ports with the 250, am working on that now.
Remember with my turbo 292 and dividers. They helped me because of the Multiport EFI, it was a scavenging problem between opposing cylinders not a flow problem.
The head, being worked up has much widened intake to manifold port and the height is also increased. Now just need to make a nice divider. Tom