You never can say with certainty but since you have a gen V that 3.5 is equivalent to about a 3.4 on a gen III. I've also heard the 04+ cars don't take to mods as well. I have not heard great things about the ZZP PCMs either. People seem to get more KR issues with them, but I have no personal experience with their tune. At any rate, I don't think you've got enough to run a 3.5. I think you'd need to add rockers, but it is tough to say. Ideally, you'd get a modular pulley system and a few pulleys in the appropriate range. Then with a scanner slowly step down to smaller pulleys until you get any KR, then back off to the last KR free pulley. But that costs some money to have all of that handy. I'd be conservative and do a 3.6 and scan.
