318 - Lifter Removal & Anti Pump-Up Lifters

I am gonna be the spoiler here, but my guess is with the miss you have you wiped out a lobe or 2 on that cam, that said I had rhoads lifters in my previous engine which only had a .475 lift cam in it and they worked fine. Good luck with your mission you will definatly need to pulll that manifold off to see what's going on in there. IMO.