Cooling/Intercooler...
This is one of my least favorite items. In fact, it bugs me so much, I don't even want to talk about it.
I used a '96 Volkswagen GTI VR6 radiator (same as the the VG30DETT listed in post #1) as well as an early (I think) Mckinny Motorsports intercooler. The short version is that everything is in the way of everything. This arrangement can be forced into submission by removing/plugging the two lower radiator passes (and a little cursing along the way helps, too). The result is a system with abrupt intercooler bends, a compromised radiator, and a cumbersome fill method. I added two Schrader valves, one on the high point of the engine, and one on the high point of the radiator. This purges the air satisfactorily, but its clearly barbaric. The intent all along has been to add a continuous bleed expansion tank. It's on the agenda... lest I get a wild hair and completely redo the whole shebang.
With a front mounted intercooler, I prefer to run a mechanical fan. A couple of agreeable surprises surfaced... an S30 fan clutch bolts on to the SR water pump, perfectly. Bolt pattern and pilot are still same as the old L-series. Cool. BUT, the S30 fan sits too far rearward. Flipping it around positions it nicely (about 5/8" from radiator), but the blades face the wrong direction. We happen to have a VG30E sitting around, and bless Nissan's little heart, they cast that fan exactly backwards. It couldn't fit any better if Nissan had planned it. Maybe they did?
So far, its been mostly cold and wet, so commenting on cooling performance is premature. I'll I can say at this point is... its 'doing fine'.