Hi,
I'm swapping a 22r from an 81 to a 80 toyota.
I finally got to mount the engine but now im stuck because the plugs on the engine (which is green and circular) and the one on the truck is square/rectangular. How would i connect it?

 

Is this the wiring harness going to the carburetor? If so, just take the one off of the other carburetor by either pulling the pins out and put them in the other one or cut and splice the wires.

 

Post pics of the plugs in question, for easy identification.

You will probably have to pull pins out of one connector and insert them into another, as supernerd says.