Before you can properly tune ANY engine be it carbs, efi, blowers etc, you need data and w/carbs it`s a wideband. So IF you had one you could tell us the rpm/throttle range and afr`s then w/that info we could better nail the answer(s). I had a 9 second car but ran 10`s until I chassis dynoed it and found out how far off I was on my tune. As I say; it`s bad enuff to be dinosauric running carbs apparently BUT w/out data it`s a guessing game especially on street cars w/a variable of throttle positions from idle, transition, cruise and wfo.............