Yup... 1990 Had "ACURA" on the left rear, trim level on the right rear (LS, GS, RS) a "INTEGRA" sticker on the center filler panel... Thats it. No "A" emblems anywhere.
1991 they put the "A" emblems on and got rid of the sticker, Possibly got rid of the trim level emblem aswell and replaced it with "INTEGRA" but dont quote me on that and if they did it carried out onto 1993.
Canadian models have the trim level below the right rear tail light.
1990 is easyer to get rid of all signs of "ACURA". Just take out the "ACURA" emblem, replace it with "HONDA" and change the steering wheel horn button to JDM or get a aftermarket wheel.
But back on topic, Yes you have to weld in the holes to properly shave them.