Your biggest limitation would be intake duration vs valve to piston clearance with the stock pistons. You can safely run 218 intake duration but more and you need to retard the cam to get valve to piston clearance and that kills torque. So I'd recomend 218/226 duration and then a 110-112 LSA depending on how agressive of an Idle you are looking for. I know the 112 LSA version makes about 415 wheel HP on a new SRT which will be in the 470 crank range and still have plenty of torque off the line unlike cams with more duration and then retarded for clearance like the Comp 273.
Regards,
Stu
