A Datsun 1200 with an L series with 130hp atw and 800kg sounds like a perfect match.
For torque which is the most gratifying part of taking corners and pulling away
from low speeds you cant go past a well setup L engine.
For longevity and life expectancy the L rules again. I still miss my 180bSSS with its
stock L18, it had 377,000klms and I pulled it apart for a re-hone and rings and all the
bearings where still within tolerances so I wacked them back in an its still went strong
for almost another 150,000 until the FJ20det went in.
With the L series you can still pick the stock heads up for pittens and port them at
your leisure if you want more, but 130hpatw with the sound of webers on full song is
hard to match.