Well, it is a 76 260z 2+2.
So from what I can find the stock dry weight is 2630lbs.
I have a larger exhaust, turbo, intercooler, Rx7 seats (weigh close to the same) so maybe another 50lbs (stab in the dark there).
Liquids (5ltr oil, 40ltr petrol, 20ltr water?) 130lbs
I weigh about 220lbs.
So that is roughly 3030lbs.
Using this ET calculator
http://www.turbofast.com.au/Drag.html
I need 240hp (not sure if this is wheels or engine) to get 100mph.
And that should net me a theoretical 13.5second run.
For those that are interested, I got my best run on youtube.