In that case wouldn't three carbs be even cooler still?
PUTY There are no aftermarket Iskenderian or Summit manifolds for the 4.0 The main reason is that the engine doesn't really have a place in the market like the 302 Ford or 350 Chevy. They don't make what they can't sell a whole trainload of.
Are you having trouble with your Fuel Injection - Are you planning on building something hot, different, bigger, better . . . tell us what you are trying to accomplish.
You have an 89 Ranger - does it have a 4.0 in it or are you thinking of a conversion?