It's an older reissue of a 1:48 scale kit from the late '50's. So while it might be good to go in with low expectations, it's actually pretty good all things considered.
These are all the parts- the White 3000 tractor with its multi-piece cab and full interior, and the Fruehauf tanker trailer. No vinyl parts, no plated parts and no clear parts- like all the old 1:48 Revell kits from this period, if you want windows, you make your own.
Yes, there's an engine- looks to be the White 477 Mustang six-cylinder gas engine. Chassis has the springs and fifth whe molded in place.
The front of the cab has the lights and bumper molded in place, but it also has very nice White script.
Decals for tractor and trailer...
And the Champion billboard.
One side of the instruction sheet, showing the assembly sequence.
And the other- featuring historical data on the tractor and trailer, and showing some of the other early Revell kits.