I recently purchased a 07' 300 SRT Design (I know, I know, but it has all the fixings of the SRT8 minus the 6.1 engine) because I couldn't find any locally that weren't beat to s**t. Hence, I came upon a one owner who had every mileage service performed, every receipt that was created, and he just took it to an auto detailer to have the urethane coat reapplied because he didn't like the water spots. I've made the purchase of a new Vortech V-3 Si-SC and the following Mishimoto cooling parts; radiator, thermostat, hoses & liquid chill.

My concern is for the valve springs and seats due to any engine heat that comes with some aggressive driving, even with the additional Mishimoto. I am wondering if I really need to pull the heads and have the them redone before install the SC & cooling parts? I'm not efficient enough to do the work myself, so does the cost justify the "spring issues" involved with the 07' 5.7L engine?