An N-law uses a thing (cannot remember the name) on his dirt track car. It's basically a piston in a cylinder with a spring on one side and
oil pressure on the other. It pipes up to the
oil filter mount (a spacer screws on to block then filter to the spacer). A solenoid valve is in the line. Valve opens when engine runs. Valve closes when engine is off. This keeps pressurized
oil trapped when engine is off. Valve opens before starting engine and oil system is pressurized and flowing before you turn the engine over.
It also supplies oil to engine in the event that the oil is shoved to the side of the pan in a spin out, causing the pick up tube to starve for oil.
I kind of think the put the lifter back in the same spot, may have as much to do with keeping it matched to the lifter bore as the cam lobe. It is a flat tappet cam. The lifter rotates, so it cannot wear to the lobe curve or it will quit rotating.