will a b16a3 fit in my 90 integra. what mods do i have to do

 

yeah but youll have your hands full with changing from cable to hydrolic tranny. and going from obd0 to obd2 ud be better off getting a 1st gen b16 sir1 its obd0 and uses a cable tranny.

 

If you have the motor, just get a good cable tranny. The motor will bolt in using the driver's side mount and bracket from your old B18A motor. Get a PR3 or PW0 ECU and distributor. You can reuse your injectors. Some wiring will be necessary for the VTEC and a few other sensors.

 

Or rewire to use a P30 ECU.