Everything said on here is accurate and what everyone is trying to tell you that owning a Mopar muscle car is a unique experinece and not something that can or should really be compared to something like a modern Corvette, Viper, exotic car. Its a completely different experience requiring a completely different mind set. Owning a old muscle car is a holistic experience; meaning you have to look at, understand, and perhpas modify much more of the car to achieve a desired result. Modern cars are generally more "modular" is design and typically built vastly better in design and materials. Therefore with a modern car when you want more performance, you can plug a computer in and adjust the PCM and net a near instant result. Also on a modern car, the suspension is better designed so that a mere shock change will completely change the driving experience. An old muscle car makes you work to achieve your results; yes there are little things that can be done and small advancements made, but overall you have to be much smarter about the car, understand cause and effect of each modification/change and compensate other systems to now deal with the changes you made. Owning and driving an old muscle car is a visceral experience, it is the pride of ownership along with the understanding of how the car operates, its limits, its capabilities. It is more like you are driving a car you designed and built (you may have actually) whereas a modern car is much more about fine tuning what the factory did to fit your desires and expectations.
Nothing wrong with a modern car, however you need to understand that a old muscle car is significantly different and going in "trying" to make it "as good" as your C6 will be a losing proposition and you will become disillusioned if you perfer the vette. However, as stated, your old muscle car will give you much more joy overall from looking at it, driving it and talking to others about it. If you have the desire and funds, go for it, I dont think you will be disappointed.