Quoting LIV4PSI:
Wop has methanol injection, which is a great safeguard against knock. I wouldn't push a stock block close to 400whp without Meth or E85.
EVO IX forged pistons on stock 6 bolt rods would be a good, cheap route. You have to have them machined just like the 2g pistons though.
I haven't always had meth injection. I installed that in '07. Before that I used 110 octane leaded fuel at the track. But it's seen lots and lots of track passes at 118mph and up. 30psi on an old FPgreen and then installed the FP3052 in '06, which is spiking to 31psi and settling at 28ish. I've played with the tune and seen knock. Even with meth, you can get knock if you push the timing, boost, or A/F too much on a given setup. The stock motors are amazing at handling good power. I don't think I'll ever do a full engine build. If anything ever happens to this one, in goes another JDM "low mile" import. Simple and effective. And I'm happy with the power output.