I actually have a fully custom fabbed waterbox that uses a smallblock chevy 90 degree swivel waterneck... I made it (ok I had it made) before I moved my waterbox to the driver side of my SRT4 head.
Worst case this would solve AJ's problem. But then he would need to use a chevy t-stat so he probably won't want to do that.
I think the PT waterneck is also taller so it would clear but it is plastic so that might not be what he wants.
-Rich