OK HERES THE DEAL I HAVE BEEN RUNNING QA1 COIL OVERS FOR AWHILE NOW BUT I NEED TO SEND MY SHOCKS BACK TO BE RE-VALVED BUT HAVE A RACE NEXT FRI. I STILL HAVE MY NON COIL OVER SHOCK BUT MY QUESTION IS WHAT HEIGHT STOCK STYLE SPRING WOULD I NEED TO USE AND AROUND ABOUT WHAT WEIGHT? I HAVE AN ALL ALUM BIG BLOCK CHEVY WITH BIG CHIEF HEADS. I WAS THINKING11" 450lb