if i was to put a stock(rebuilt) l28et into a 240z how fast in the 1/4 mi. and 0-60 do you guys think it would be?

depends on the year and weight of your Z. the stock 70 71 240's ran 1/4 times of 15.7 secs if im remembering correctly. this was on a 130 roughly hp engine. no put in a turbo engine and that coupled with the fact it probably has about a realistic hp of 165 you can go from there. no to mention you can always go further.