Yes, it will.
no
A V8 engine
Yes
Yes a chevrolet 350 small block will fit in a 1987 Buick Regal.
Yes it will, if the 350 intake is from a pre-1987 engine.
1987 is the last year for a carburetor.
If the engine is either a 2.5L 4 cylinder engine or a 2.8L 3.1L V6 it should go in.
Yes it will, if the 350 intake is from a pre-1987 engine.
1984 through 1987 as long as the motor is the same.
Yes, That will be a direct bolt up. NO problems there the same.
Google "Jegs"
That is referred to as "back dating" and it is illegal at the federal level.