[AcampoDave]

Remember the 4.3 liter V6 has a first and second generation. I copied this from Wilipedia....
The Chevrolet 90° V6 family of V6 engines began in 1978 with the Chevrolet 200 cu in (3.3 L) as the base engine for the all new 1978 Chevrolet Malibu. The original engine family was phased out in early 2014, with its final use as the 4.3 L (262 cu in) V6 engine used in Chevrolet and GMC trucks and vans. Its phaseout marks the end of an era of Chevrolet small-block engine designs dating back to the 1955 model year. A new Generation V 4.3 L (262 cu in) V6 variant entered production in late 2013, based on the LT1 small block V8 used in the 2014 Chevrolet Silverado.

I have a 2017 Extra Cab with the second generation version. It runs a service route with a moderate load and the computer says I get 20mpg exactly. The computer also says my average overall speed is 27 miles per hour. (Lots of city driving). Its a sweet motor and coupled with the 6 speed automatic it always finds the perfect rpm for every occasion. It also has the cylinder deactivation tech on it and i'm really good at finding the sweet spot to cruise it on four cyl.
It would easily power a Chevy Nova.