[Steeveedee]

Take the easy way out. If your oil leaks are that big, just start at the top and work your way down. How big a puddle do you see, overnight? Might be your oil pressure sender (oil light) or the gauge line. Clean it up well, and look for the source before you go dropping a ton of money on it. It shouldn't take a ton of money to seal it up. Rear main is a bigger deal, but you can check that at the flywheel cover.

Pull the PCV valve out of the valve cover and see how much blow-by you have. If it's blowing a lot of smoke, any sealing up you do is going to leak because of positive crankcase pressure, eventually. Blow-by means rings and/or cylinders are excessively worn, and I personally won't just hone, put in rings and roll in a set of rod and main bearings if there is blow-by. It's a waste of money.