I know this has been discussed sometime back, but this is our first go around with a blower motor. We are putting togeather a 540 BBC with a 12-71 @ 20psi boost at 8000 rpm max. We are using a set of Sonny's BB5's with 2.300 SS intakes and 2.19 SS exhaust valves. The cam is .748/.748 lift and 286 @.050. Pushrods are 7/16, .165 wall, .904 Morel lifters. We have PAC springs that are 425 lbs. on the seat and 1000 lbs. open. My concern is this to much spring for our combo?? I had a great deal of confusion from guys saying it's too much and others actually saying it should have more. Lets here what you guy's think before we button this thing up. Thanks!