spark plugs

how do you get to the rear spark plugs on a 1990 lumina with the 3.1? the fronts are easy but the back I cant see and I don't kniow how to pull the motor foward.

Unbolt the front upper dogbone mounts and pull the engine forward, then I block the engine in that position using a piece of 2x4 between the firewall and the engine.

do I leave the car in park? and the engine will just pull foward when i unbolt them and pull?

You could put in neutral, block wheels, the engine rocks forward fairly easy, but I am 225 lbs, you may need a pry bar to do this?