Got a 72 cleveland that came with the car I just bought. It sat for probably around 10 years. Had it started for a few times here and there and then it started missing. Found out the cam had some flat lobes and it completely wrecked the lifters on the lobes it took out. I think there were 3 lobes. Stock bottom end with stock 4 barrel heads. Stock rockers, springs, everything. Put a new cam in. Comp 280h. cam with .530 lift. Probably got 15 miles on it and it took two different lobes out on the cam again.Why?? And yes, I had plenty of lube and broke it in for 15 minutes at 2500rpm. What should I try now??? Any help would be greatly appreciated. Thanks much!!