Your engine weight was reduced because you are talking about replacing the engine in a Z32 right? What small block are you putting in? In the first gen Z's putting in a cast iron GM V8 adds about 100lbs.
It wasnt very radical, 600cfm 4-bbl., 280Hp 5.7 Chevy motor. T-5 transmission.
It was fast in a straight line, but lost the secure feeling of a stock Z in the corners.