Oil leak

Check around seal in picture as well as top as they may be old and leaking. Also, check oil pressure switch it may be on block. We have no picture of it or location. It could be leaking and blowing on top of engine.

No pcv valves only suck oil vapor when engine is running so if it leaked then it wold get sucked into engine. However if pcv valve isn't sucking like at idle etc. Then it would cause an oil leak because of to much pressure in engine. Pull it out while running and stick your finger on bottom of valve if you feel good suction then it works. If not it may be a bad valve/plugged line etc. Try that. As I cannot see where oil is leaking then it makes it hard for me. Also check near oil pressure switch as those leak as well and see if oil filter is tight.

Check for a blown head gasket it may be going into cylinder from that. There is a chemical for purchase at auto parts that you dump into coolant it may tell you can also pressure check coolant even though you are using oil. Especially with mileage you have on engine. If you want do a compression check as well

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It sounds like you have a few issues. External oil leaks as well as oil burning in the engine.
For the external leaks I would start by cleaning the engine off real well. Use some engine cleaner on it with it warm. Don't use a full power pressure washer on it though, that can get water into places you don't want it. Just a regular hose or low pressure rinse. Then dust the engine with flour, baby powder or foot powder. Then start it up. Look for the areas the powder gets damp with oil. Those would be the external leaks. Repairing those is a start. I would just buy the correct gaskets from a place like rock auto. That way you know you have good seals. The silicone will actually glue things together, that usually means they come apart hard the next time.
Then once you are not leaking externally you can check on the oil burning. Unfortunately most companies these days have very high numbers for "acceptable" oil use. GM used to say one quart in 1000 miles was excessive, now that isn't the case, with some engines they say that is "normal". Not for me it isn't.
3.5 quarts is a lot of oil use. Burning even half of that will cause the converter to die an early death. How many miles and which engine do you have?