They both are under the valve covers, where the oil is slinging everywhere, when the motor is running. Perfectly normal.
There will be a cap on the valve cover. Usually the drivers side, but, it varies.
how to install the oil pressure gauge on a Chevy 350 small block
Yes it can, you will also need the big block pickup tube
10w-40.
45 lbs.
5 quarts, same as all the rest of Chevy small blocks
generally 5w 30
1/4" NPT
10 W 40
One of the valve covers.
Depending on the year, either behind the distributor, or, above the oil filter.
Check your oil, if it looks the same you may have a blown head gasket. If your oil looks okay you may just have had some water get in it from somewhere else. I found that i had milky residue in my breather and the problem ended up being the carb was forcing air back down the breather tube. When air is forced into a small space it compresses and moisturises. The solution was to take off the breather tube and put a cap or separate breather filter on it.