I run a 71 340 Demon in stock eliminator and have always used the 002/003 S/S springs right from Summit. The car runs 1.39 short times and have gone a best of 10.77 last season and 10.79 this season. Thats on a 12.15 index. Save the money and buy a set of S/S springs. You might be able to find a set of used ones on ebay or this site. With your power potential you certainly don't need the CalTacks. Just my opinion from my experience. The difference in price? Caltracks complete system - about $350 without the shocks that make them work the best, S/S springs from Summit about $250 delivered and you don't need to get special shocks.
That's my car to the left on 5 year old S/S springs.
Ken
Edison, NJ