95b16ej1

Ok I just bought this car a week ago (95 civic coupe EX with JDM b16a) and am wanting to know some things about the engne. Previous owner says its a obd1 b16a. the head has a MFR date of 9/1 on the little clock thingys and the block has a serial code of 5xxxxxx..... the injector plugs have been cut off and rewired no clue why, No cels,small oil leak, 32-36mpg when i stay out of it.It runs great just wanting to know what type of motor it is, also trannys produced before 96 didnt have a vin so is there any way to tell if this is a Y21 or s21( i think???) thanks and sorry for the long post (only get 5 a day)