In response to several comments: Engine is coupled up to a C6 driving a non LSD 3.55. 8.5 x 16 rims.
A few comforts not available in 1971.... Cruise control, A/C & heater. Power steering from a Datsun 240K next project!
I tried to attach a photo but it's too big. Well, too big for me to attach.
The 300 does not produce impressive fuel economy around town, but out in the open I get around 21 or so mpg. [you youngsters can google that into modern lingo]. There are numerous means by which to raise that figure to 24 - 25 or so.
I've only averaged 2,000 miles per year since 1978 so fuel economy is no biggy. [this calendar year it's traveled 42 km].
With very basic bolt ons there's no problem squeezing out 250+HP.
It certainly does not have the 'slap you back in the seat' zip of a modern engine, but it could tow the Queen Mary out of a mud flat. I'm still toying with the idea of a Barra just for fun.
I bought this truck when I was 23 & I'm now 65. It was my wedding car - now it's just a distraction half way through a back to metal re-paint.
I still have the 240.