the 89 silvias got the ca18de dont they ???.... then id go with the DET.... really easy to get where you are they import it from japan so shouldnt cost you more than 750$aussies... then engine will bolt to you current tranny if im not mistaken (anyone), but youll probably need some wiring done... better yet, buy a front clip from a jap silvia... then youll have everything you need !! 
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Crazy !
Sentra Sport Coupe 87 Turbo
14.850@97.454mph
H&R Spring, 15psi, TMIC, 370cc, Nismo mount and pulley, Almasi tuned ecu...
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