the GT40s are about 85-90 lbs installed!! For a performance spring ( hyd roller .500 lift and above) you should have WHAT the cam says to have, however the 130-140 seat 320 on the nose is pretty much right for all !! Check the classifeds for spring sets.. cool??
Thanks guys, I have a f cam laying around I was gonna toss in untill I put the new motor in in the spring, but was not sure if the oem gt40 springs would hold up for a few months.