ignition switch/key problem(HELP)

[72Z/28]

You are describing a mechanical, not electrical issue. When it was converted, was it from a column shift? If so, try moving (rotating) the outer housing near the dash CCW. This may release the locking mechanism which ensured the car was in Park in order to remove the car. My car can do the same as it too was a factory auto column shift car.

Actually I am not sure if the car used to have automatic transmission. It is not a column shift(do you mean shifter lever is on the steering column). I am just guessing that it has ben converted to manual because I noticed a slight modification on the transmission tunel openning for the shifter lever.