The simple way is to purchase the correct oil pan, pump pickup, and mounts for the V8 version of this car. However, there are kits to do it for high performance use.
They weren't known as Chevy IIs in 1979, but yes, they could have a V8
sure
NO it will not.
Yes
1995 chevy 1500 , 350 v8
Yes
A V8 engine
Before 2000, yes. After, no.
YES, That is a direct swop.
Any smallblock Chevy engine will physically "fit" into a 85 Impala
Yes it will, It should already have a small block Chevy in it , if it's a V8.
The only one I can think of is the exhaust Y-pipe may not fit from the 305 to the 350.