Oh Franken, you are Gregory C. who originally started this question on the B-Body forum. I advised you to get a bigger camshaft from my first post which seems like forever ago. Don't know why you didn't go with the .590MP solid camshaft. I have around two thousand street miles on mine with no issues. Very similar specs and lift would still be right under .600 after valve lash with 1.6's and duration is 272* @ .050. It's pretty timid in a 440 with a 4-speed. Would be cake in an auto 500 cube stroker with a 3500+ stall.