I have both.. I personally prefer the 350 for driving around. The overall feel and handling is more enjoyable. The 500 is raw and tires are shit and car feels like it wants to rip itself in half, kill you or both. Tires don't help its cause. The 350 is the Labrador of cars ... does everything well.
Iac code and motor stock rebuild just because. New Pistons overbore and arp studs and rod bolts. Car had 181k plus. Could be coils as I didn't replace same.
The car has enough to run with GT 500 from a roll. Has small ass blower and torque to move it along. We will see in spring what they run in quarter to put in a verdict for sure.
zl1 is eons ahead handling and ride wise the power feels more violent in GT 500... It's an amazing car that does everything well. Like the love child of a GT 500 and the GT350.