Super Stock Springs...do they make that much of a difference

sledge, you might not remember me but we met at St.Louis at a nsca race several years ago. I had a gold 67 dart with a cowl hood running in ez/street. I had slapper bars on the car for several years and never had a problem , the car would go 1:41 60 footers. It was an iron headed (indy) 400in. flat solid cam and 3450lb. with driver, and a 175 hp shot off a cheater plate. I recently changed to cal/tracs and a better motor and after 3 outings still haven't tuned it into the 1:40s yet. I do have the slapper bars for sale though and will be at the KOS race in Penn. in a couple weeks. let me know and we'll talk more.
Jeff r aka smalltyredart