Early LA 360 Blocks

Strkrscmp: Hale Yeeea! Thats what i want to hear. I have no blocks past 73 left in my collection to compare an early to. Only 340s and early 360s. Was sure someone had already done this, but didnt want to read thru a bunch of condescending juvenile bs to get to it. :)
Higher nickel in the early? My machinist gripes whenever i bring an early to be bored/decked/mains resized.
Due to better metal or just old and seasoned?
File test on mag/vs early: mag cuts like butter, early is one hard sob.