11 second street car?

Hey guys. This is my first post. Im looking at purchasing a 72 Plymouth Scamp. The car is a stock 2 barrel 318 with a set a headers with an auto tranny. Ive mainly been into Chevys when it comes to older stuff, but have always wanted an old Mopar. Im curious as to what it would take to get this car in the mid 11's, or close to it. I would want this car naturally aspirated. I know its a pretty vague question, but im just looking to get an idea of what kind of investment I would have in the car. Im sure the 318 is out. Any help would be appreciated, Thanks!!