Some info.
Your observations are correct, the B14 IM is better than the B13. I have compared the B13 IM gasket to the B14 and it is significantly different. I believe the biggest difference is the coolant passage on the head. Also IIRC the bolt pattern is different, not to mention spacing. That said the B14 head is better as well with straighter ports and the B14 cams have a bit more top end than the B13 cams. It is a rather involved swap in terms of putting a B14 head on a B13 car.
The larger TB would help quite a bit, I'm assuming this taper is in the IM itself? can the same effect be achieved (to some degree) by a nice velocity stack on the intake itself? After all both are before the throttle plate correct?
If you need detailed pics. of a B14 cylinder head and IM I have them.
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