New to mopar.. 340?

The 340s are revving engines. So while you may get it to run mid 12s witht hose gears and convertor, I think it will prove very difficult. 340s are not torquey so you need to rev them. If it's got the usual cam/intake/headers deal I'd think you should have no issues going deep into the 13s on street tires and full exh. But it's asking a lot to run mid 12s.