I removed cylinder heads from a 1977 460 that I plan on putting in my fox body notch!!!! This engine has a little over 10k on it since its rebuild in 1993!!! I just drove the truck home on friday and removed engine!! It ran well with no smoke ,no noises ect... When we inspected cylinder walls last night I noticed there were some scuffs on the thrust sides on cylinder !! Heavier on first 2 cylinders and on the intake side!!! All the cylinders had scuffs but definately got lighter after front 2 cylinders , you cant feel them with your nail ,but the rest of cylinder has cross hatch and on the worst cylinder it rubbed the cross hatch away about an inch wide!!! What do you think dirt??? Should I run it ??? It is .030 over as indicated by piston tops!!!!!thanx