Been awhile so it's time to update:
Nothing. It's been running great and averaging about 17 mpg on my daily commute to and from work. I have noticed the heater works very well, probably because the vortec likes to run about 195f. The fans don't kick on until it gets to 206 which is very infrequent.
I invested in the hp tuners software so that I could find tune the engine. Mail order tunes will get you running but it's impossible to dial the motor in like that. hp tuners is a godsend.
Finally the v8 power is a bit of a handful in the snow and ice. It's extremely easy to spin all four tires. It needs traction control.
1994 FZJ80. Elocked, MAF 3/2 Lift, BFG 315 KM2s, stock 4.10s, ARB bullbar and a Warn 8074 winch.
powered by an all-aluminum 335hp L33 Vortec V8
2004 Kona Stinky dee-lux.