[Roger 911]

"If you had E heads, you would still have the same problem."

Are you sure? Every reference I have read shows E intake ports at 32mm (I know some books also erroneously show T ports at 32mm, but this is not correct). I know the base of the T MFI throttle bodies actually narrows to 29mm, so maybe you are referring to the diameter of the base of E throttle bodies? I have also read that there is potentially a benefit to having the port slightly wider than the manifold base.

"I have an easier way. Buy some plastic insulator gaskets from someone like PMO. They are about 5mm thick and you can taper them to remove the step."

I currently have a set of these, but they are about 35mm. I didn't realize they came in different sizes. I like this idea, if I could get a 30mm set.