You don’t need a 350 to get a 240Z into 300HP range. Been there, done that! The fact that it weighs less than half of what many of the vehicles listed on that slideshow weigh only makes it more potent at that level.
But if you have relatively inexpensive ways to increase HP from 150 stock to 300+ on my 240z let me know!
It still makes me sick to think about it. When I was in Japan, a buddy offered me a cherry 1971 Japanese 240Z with the engine done up in racing trim. Cam and what-not, I don’t recall. He was only asking $500.
I was in the USAF at the time, so it wouldn’t have cost too awful much to ship it to the states. If I had gotten tired of driving on the wrong side of the road, I could have sold it for a pretty penny.