Advice on my "stock" 340 build

some reasons some run better than others is how they are driven and maintained.
*Need to be driven hard to seat rings
*choke is set too rich it washes down the cylinders.
*seldom or never changed the oil that takes a toll
*drive on short trips in winter with choke on and never warm it up
*warm it up before you run it hard.
*keep oil clean and full

I worked at dealerships and never understood all the cars in for warranty oil leaks. I bought a 1992 car new and it still has original gaskets including valve cover gaskets, never leaked, 90K now.