Paul, after messing with trying to figure out how to hook up hoses to the other two vents with the old unit, I think you may be right. That's why I've been looking at the Gen IV units. I've been trying like hell NOT to re-do a bunch of stuff on this car that I've already done, or I'll never finish it.
I could probably eBay my older cable unit and get most of my money back. It's never been used, just used as mockup and I have all the parts. If anyone here is interested let me know. I think I paid $675 plus shipping for it.
I wonder if they have the option for the orientation of the outlets. Mine might work better with the old setup if the hoses don't hit my radio. I guess I'll have to give them a call and see where I can get the best deal on a new one. Now I have to weld on that finished firewall again and make up all new lines.