Absolutely fantastic.
THAT is all you need--those types of karts. Look, you fit both of them...in whatever that is (pickup bed).
That one on the left looks like a Manco 400, the other one--not sure as of yet, but the steering linkage, the short and the long rods is distinctive.
Complete set of wheels, some seat padding, engines, cables, chains, clutches...and you'll be back on the road or the trail in no time.