For 350, you will need aux fueling no matter what. You will probably need a meth setup for safety. Realize anything past the stock fuel limits of around 300 gets very expensive, very quickly. I trust the rods but I wouldn't trust the pistons long term at 350. Someone more experienced than me will have to chime in.
I'm planning to getting around 270 hp to the wheels with just 93, I'm a bit hesitant to trust aux fueling. If I want more power, I'm just going to use a crap-ton of meth and a 35-50 hp shot of N2O. I'm more comfortable with a conservative tune and just play the AFR of the nitrous, water, and meth by ear.
Really though, happy gas is a gift from the car gods. I imagine they look like vikings and have heavy metal playing in the background. N2O may be safer and cheaper...or you could melt a hole in one of your pistons...or nuke the block.
Good luck!