How would you build a low 10’s street car

The hard part isn't that it is hard but for me spending the money was hard. The car is an endless money pit. And I bartered machine and transmission, work did my own assembly work all the fab, paint and bodywork and my business brought parts and materials with some donated by jobbers. It was a good promotional tool for the business but the money still went out.
The best thing you can do is list every thing you want and need to do if your planning to run this at a track and put a cost to it. Spend time doing this and go from front to back on the car as it was done earlier and be thorough. Don't bullshit yourself on what this is going to cost because it happens a lot, there's plenty of cars that never get finished. Then figure out how much money you need to come up with to do it.
I will say the cost of my Volare doubled going from 11.80s to 10.50s, 1180s were cheap.