In relation to itbs...

A) can you get guillotine throttle bodies? (for efi)

B) if not are the keihin FCR carbs that Maruha sell any good?

C) how much have you made on your efi or carby setups?

 

I have no background with itbs but a friend is running dual sidedraught weber 40mm carbs on his Miata and went 13.38 in the quarter mile. I'll see if I can find a link to his thread on it.

Here it is.

And here is his quest in progress to break into the 11's on the motor. Lots of weight reduction involved.

I don't have any answers to your other questions because it is out of my area of expertise.