Found this on a VIN decoder site. It is a 88.5 by the looks of the square dash vents and no tach. It is not a TBI as FI did not come along until 1990.
1988 SUZUKI SAMURAI VIN: JS4JC51C4J424xxxx
World region: Asia
Manufactured in: Japan
Year: 1988
Make: Suzuki
Model: SAMURAI
Body style:Convertible
Transmission:5 Spd Manual
Drive type:4WD
Cylinders:4 Cylinders
Safety restraints:Active(Manual) Belts
Standard options:Power Brakes, AM/FM Stereo, Cassette