How would you build a low 10’s street car

Ditto as long as you add in, “Stuck in traffic from N.J. Through NYC crawling in stop and go for 30 miles without overheating or breaking down.”

“Streetabilty” is a term that varies by perspectives and things like fuel mileage, street friendliness & creature comfort. What ever your willing to live with and live without is also a wide and varied field. If you don’t mind driving to the track on hazy, hot, humid 99* days without A/C, God bless ya!
  1. I will never drive my classic in NYC, nor do i ever plan to go there. I hate big cities.
  2. I already drive all 4 of my classics without A/C on summer days that's hot and humid. In fact, last September we went through 9 states and almost 4k miles on vacation in one of them with no A/C. Does that qualify as a street car???? LOL (oh, we went through OKC, Tulsa, Amarillo Tx, Flagstaff, Albuquerque, NM) :) She got 13 mpg.