I tried to change the spark plugs on my 1988 Cutlass 2.8 liter, but cant get to the back side plugs. Anybody have the same issues, and if so, how did you get these plugs out? Thanks for any help.

you have to rotate the engine forward to get to the back plugs

A pretty easy way to do is remove the Dog Bone mounts and push the car foward and when you see the engine rock foward and stop push the E-brake and hold it like that.