Plastigauge for sure. Learn to use a micrometer is the best. And some arithmetic skills. But I never learned from my successes, just my screw ups. The very first engine I rebuilt was an Olds V-8. Everything was good until the one rod cap nut I did not put a torque wrench on let go. But that is how I learned to sleeve a cylinder and use a torque wrench. Also got better at stuffing money into my project jar..:) Best of luck as you go.
