Unfortunately the starter ois located in the valley between the cylinder banks
you have to remove the intake to replace it.(very labor intensive procedure)
intake gaskets are about$90 and the starter from Autozone is about $250.
you better know what you are doing befor you tear into this engine....
diagram for 94 Cadillac Seville starter
Yes
as long as they are both 4.9 liter engines yes,
The starter solenoid on a 1986 Cadillac Coupe Deville is located under the front of the vehicle. It is to the left of the oil pan.
The starter on a 1995 Cadillac DeVille is removed by disconnecting the battery, unbolting the starter, and lowering it slightly. The wiring harness can then be disconnected, the starter removed, and a new unit put in place.
under the lower intake manifold
Should be on top of the starter
Front of engine below exhaust manifold
Jump the starter solenoid Take jumper wire from Battery + to trigger wire to starter (mounted on top of starter)
its located under the engine cover in between the heads
This job is very difficult, and you probally should find a garage to do this for you. The starter is located inside of the motor.
Check out this link. It has all the info you need http://www.freeengineinfo.com/cadillac-northstar-starter-replacement.htm