Is this a B4 front end? It's a 90 CQ

 

well ye, audi 1988-1992 were B3 which were flat hoods no grill, then they changed it and it became B4 with a hood and grill together.
audi 80/90 had that change only. then came A4 which was B5 and B6 and B7 and audi 80/90 from 70's till 1988 were B1 and B2. B2 looked like 5000/4000, and B1 had a cool lock.

 

Yep sure is man

 

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I second that