What size 20s will you need for a 1985 olds cutlass?

20 x 7 would be best any bigger and youll have tire rub when u turn or youll have to get lift spindles or taller coils, i run 20 x 7s on my 81 cutlass they fit but my front end sagged so i had to get springs from a delta 88 to give me a little more height