RE: New versions of muscle cars
I think that most people don't have the savvy and or time so they just get all they can even though they might not get the best bang/buck but they get the name.
The Whipple name you mentioned I think was used originally on the Ford GT 5.4L engine. What an awesome car!
If you can do all of the work, then more power to you because then you get the car you want and the satisfaction that you did it all and can show it off.
Assuming the Challenger has all the horsepower I want, one thing I may do is replace the interior engine parts with polished parts or something like that.
I will decide that when I see the final car in my garage.
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For I know the plans I have for you," declares the LORD, "plans to prosper you and not to harm you, plans to give you hope and a future. Then you will call upon me and come and pray to me, and I will listen to you. You will seek me and find me when you seek me with all your heart.