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yes
A lot of wheel well fabrication.
Before installing 20 inch rims on your 1991 Deville, you will need to buy new shocks and air sensors. This will help to make sure that the larger wheels do not rub against the other parts of the car, causing wear and damage.
It will be quite slower on take-off.
because its a Chevy
4
yes...DO IT!!!!! but u need to widen your guards and take out your stock mud insulators
It takes 2.5cm to make 1 inch.
110 of them.
just take a look at the bolt pattern, that should tell you
There are 16 squares with sides of a quarter inch in one square inch.
Yes, just make sure you take it to a front end shop to make sure the brakes can handle the extra weight, that they do a complete alignment and be advised that your turning radius will probably be effected by the oversize tires your going to use on it