my cam has a .589/.598 lift with the 921 dual springs..... when should i start looking to replace.... how many miles?

this winter i will be using a new motor so i dont wanna wast money on springs if they will last till then.... but i dont wanna blow my **** up either

 

winter is just aroudn the corner how many miles on the springs how hard do u drive the car and how often?

 

it has been down the track about 10-15 times.... i probably have 5-7k miles on them.... once a week i might get on it to about a 130 pull for a street race... other than that pretty tame.... i have 4.10 gears and 4000 stall

 

thats it !! o man those springs are rated at 650 lift u'll make it to the winter dot worry u'll be ok