What is needed to build a 7 second (1/8th) street car

My dart went mid 7's in the eighth with a real streetable combo. 3.91 gear and 26" tires..

Nothing really exotic about the combo. If I remember from the time slip math the car had about 350 hp at the wheels...

You have a lot more done to your 340 then I had done to my 360 it sounds. Your 60' is killing you.. With 340 torsion bars, stock original 100,000 mile slant 6 leaf springs with air shocks my car would 60' at 1.69