Early 90s 205 without removing the swim platform, you're going to need about 23 feet.
An early 90s (91-94) 190 is only 1 foot shorter. Assuming the trailer is different, the answer is one foot.
But my guess is that the trailers aren't too different in their lengths, so my best educated answer is less than a foot.
Boat lengths without the platform/trailer is 20'5" for the 205 and 19'5" for the 190 of that era.
Previous: 1993 Prostar 205
Red 1998 Ski Nautique, PCM GT40, 310 hp, , Acme 4 blade, Perfect Pass SG/Zbox.
Be kind. Have fun.