Did a Bit of Tuning Tonight.....

hmmm. I am by no means an expert but i would think your open spring pressure should be closer to 350 or 360 @.500? last chebby we did was .510 and I seem to remember them being somewhere around there. with the 1.6 rockers that puts you a little over .500 lift so maybe you do need the stiffer springs. I have the same cam in my 318 but with 1.5's and it will pull up to about 6,000 r's till its out of breath. are your springs number 69308-1?