According to my Chilton book :
The 302 cubic inch ( 5.0 liter ) is 150 horsepower at 3200 RPM and 270 ft/lbs torque at 2000 RPM ( which is fuel injected )
The 351 cubic inch ( 5.8 liter ) is 180 horsepower at 3600 RPM and 285 ft/lbs torque at 2400 RPM ( which has a carburetor )
On a 1989 Ford Crown Victoria : ( there are 5 lugs per wheel , total of 20 )
There are two oxygen sensors on a 1989 Crown Victoria. One is located on each of the exhaust pipes coming off the exhaust manifold.
No, the Crown Vic and Grand Marq used different styles of fenders
On a 1989 Ford Crown Victoria : The gas tank size is ( 20 U.S. gallons ) according to my Chilton's repair manual
130
On the used side, $40ish at a junk yard. Ebay is running about $89-$130.
Drain oil and replace filter. Add 5 quarts and check the level.
89 HP
If it is a older Crown Victoria,( had to replace a window in 89 grand marq.) you have to take off the door panel to get to the window motor and i believe also there are some springs too, and put it on track. Isn't much of a answer you was looking for but it's a start...
Around 200-210
put it in drive gear and try and start it if it does start while in gear its bad if it doesnt its good.
Starting poblems? Like, no fuel, no ign. (fire) does the engine turn over? Need more info.