I just replaced the motor and 5spd transmission in my 90 NA with a used setup from a 93 car.
The motor has about 10k miles on it after being completely rebuilt. For some reason the motor consumed oil and smoked which is why i replaced it. I didn't have the time to deal with tearing this motor apart to diagnose the cause of this.
The transmission that came out of the car has a notchy feel going into 2nd gear and also has a whine most noticeable in 5th gear on the highway.
Please feel free to email me with questions.
chriskphillips@gmail.com
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1990 NA Motor / 5 Spd. Transmission - ORLANDO - chriztopherkent08:21:00 11/27/06