what would it take to do 175 in a 69 charger

It is possible although unlikely, all the power/ gear ratio and aerodynamic stuff has been said already. Being let go is another thing... I've personally been arrested for 153mph by radar from aircraft and I will say there is nothing faster than a radio! I was completely unaware they were after me until I came up on the roadblock! The cops rolled up on me guns drawn, took me to jail and impounded the car. In the state of California it is a felony if you double the speed limit. Luckily my best friends girlfriend was the daughter of the district attorney, since my dad said "good luck" and hung up on me! I was not driving a 68 charger(unfortunately) but I was in a Dodge...well kinda, it was a 93' Stealth r/t twin turbo v6, and the best part is... it was my mom's car!

"my pappy said son yer gonna drive me to drinking if you don't stop driving that hot rod lincoln"

Mom now has a 03' zo6 Corvette, guess it runs in the family.